Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f5a354f24d789…

MALICIOUS

PDF

93.9 KB Created: 2021-05-23 23:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1486e8fcf71522acf644060197ad1b9b SHA-1: 2585d9100b4be52dae58e0408f5ba40fdc0f8d60 SHA-256: 7c4f5a354f24d78960ca20cde886e67a9845d3c9ac8bd4dbd357fb6ad4742069
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate malicious content. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=negative+numbers+math+functions PDF link annotation
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/9158442.pdfIn PDF document text
    • https://gesinanafu.weebly.com/uploads/1/3/4/4/134481382/kivoxizima-guwatipa-rerukik.pdfIn PDF document text
    • https://romijefovakom.weebly.com/uploads/1/3/1/4/131454567/libixek.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/acf355c42e7f4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/abea6e93-ed3e-401b-940b-779e7c1e372f/lean_analytics_one_metric_that_matters.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/zagopuvosivepojaritopan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c278b54-45c4-475c-ac4a-a2c2b82ab918/essay_for_6th_grade_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c99527b-059d-4712-8e5e-a4e6c0cacd12/york_furnace_ignitor_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/57064836079.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/72919400435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23eae498-8073-4a39-8ddc-53be1668add1/cramer_84_studies_para_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba468091-2ce2-4948-a9f2-8185c7036812/sherlock_holmes_novels_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58c921e-c615-431a-a561-c45051ba1b53/wenujipazetuxukeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a22dfa5-6bc2-4ac7-bcff-22bd1327066b/29307012780.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/14579459978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257cffba-087f-458b-bfc4-eb5d73ecc415/97032812398.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/54151746539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299b6e48-c7a9-4b33-9aa5-6840917f65ce/pivasibugek.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/ireport_5._6_0_not_starting.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 5432 bytes
SHA-256: aa1ea446a4e83cf889f04db9416c0e79c710cb4dcb8280ef6b0434ec9469a3fc
font_01_sfnt_off00013f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 13260 bytes
SHA-256: 79b3e085fe4095b30c406b44fa053b0573b43479acaa337f248ce756e4010f71

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