Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc1d98c768413e…

MALICIOUS

PDF

72.4 KB Created: 2021-06-08 20:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 99b9973bf58291c714fb2325257d7179 SHA-1: 19ebb43959769dc5c85ca84ebb7350b1dc5e92af SHA-256: a2dc1d98c768413ed19303797270e41c0625262d121d1066191368f5a4ca7e09
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=rich+dad+poor+dad+telugu+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464297/normal_60379d6dc5956.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/3126360.pdfIn PDF document text
    • https://gewolokumopez.weebly.com/uploads/1/3/0/8/130814623/6503829.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/mojegu.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/kijozokeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_6064b87645294.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/dufutikagikura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_60b96f33401e8.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/xepifulenorove.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/1849857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_601f7184cbdb8.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
    • https://uploads.strikinglycdn.com/files/522eb909-6373-4769-8b32-57d7be787dec/laneroki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1176cc-44e9-4297-9686-9215204c88fe/pretty_little_liars_season_7_full_episodes_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c93552-1b3a-4921-89b2-c46be7d8a235/anatomy_and_physiology_lab_practical_2_slides.pdfIn PDF document text
    • http://pebakix.pbworks.com/f/adventure_capitalist_mod_apk_8.6.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9313ea-b2bc-4bb0-8226-dbc414b1fc50/15941974594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5154a1f0-4ae3-4c39-948d-2338126fca4a/pudawasejamexefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad4ea62-ae26-4ec3-9420-0641def9f3fe/difference_between_empathy_and_sympathy.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/w/file/fetch/144564921/mafeguxofanazofupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcde7b4f-7319-4149-a4f3-41c21348974e/91536895343.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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 5020 bytes
SHA-256: 0697d8b767ba64cbb9dc533522b280db2e607bc1c51f02dbbe1b4ac08cc3fbef
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10228 bytes
SHA-256: 10aab51498209607fc23e82f0dccd0302ec8fc116ce73dfd668a471eeffee8a0
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71