Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b565d284482d372…

MALICIOUS

PDF

77.9 KB Created: 2021-06-07 06:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4d96ba3c3ff276922df21d25f99caac2 SHA-1: d56c82ba3fca651506475eac1e6b5ce932bcdd07 SHA-256: 1b565d284482d3725cc0b9137a449948f5b3edfd49dbac2f736960d02b2343f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farming or phishing schemes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources. The primary URL, https://inwebjor.ru/pbw?utm_term=2020+honda+cbr500r+service+manual, suggests a lure related to a service manual, potentially to trick users into clicking through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/pbw?utm_term=2020+honda+cbr500r+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447265/normal_606e814da9edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_5fdb6adea1fa6.pdfIn PDF document text
    • https://netavobedeve.weebly.com/uploads/1/3/0/7/130775758/7312935.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/9d0dc637bd8cdc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_6041c8cab7127.pdfIn PDF document text
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/7937860.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/linizaku-duzovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460972/normal_6040466ebd616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477379/normal_5fe0c3c6dba67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_60245dbcb2463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fccd11cb3279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fd14e4f850a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe826d2e602e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb4ddb0ea41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_6016a78003223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_60b8174bd139a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fc5d8c245137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fca69b962d26.pdfIn PDF document text
    • https://palufiboninu.weebly.com/uploads/1/3/6/0/136020493/xenolaf-ratupudekelupo-nuvovazarebup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sokulus.pbworks.com/f/second_conditional_exercises_upper_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8363ce-b061-4f67-b774-93ce86853e0f/78043518972.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/rna_transcription_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4932f61f-7ce2-4720-a39e-c1891c776b5b/how_to_turn_off_harman_pellet_stove.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/magasavozafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6e0690-22c9-45ac-bd9b-13c723bbe8bf/dark_alliance_2020_ps4.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144649836/hack_matchington_mansion_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477ead8f-9206-4d1d-9861-5576fff3c857/digelegetogifexuzifuzili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab66964-2d54-41db-aabf-84957f5be5a2/81539289034.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5484 bytes
SHA-256: b581d54ffec6776bbc977e00925e1583968f7eab7507e2fde90df895e64c9388
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10452 bytes
SHA-256: b7b2d0be3fa4a16dc7f6cabf30e9e2ba4f0b416a8ce91dfb7a23c4a908c2b865
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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