Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e5a3d8fea6d847…

MALICIOUS

PDF

67.9 KB Created: 2021-01-10 10:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7c1d8e5819bb2daeef77f3ad7e4a5152 SHA-1: 7a29ef293e20b26e23a5a65c6ab42da413cce06b SHA-256: a8e5a3d8fea6d8471c041cead498f989982cf6241576dc29a5f59e7b700bbd87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic and numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=binary+tree+zigzag+level+order+traversal+leetcode+solution PDF link annotation
    • https://site-1177969.mozfiles.com/files/1177969/26959083161.pdfIn PDF document text
    • https://site-1172118.mozfiles.com/files/1172118/video_recorder_for_android_free.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/6121781.pdfIn PDF document text
    • https://site-1177347.mozfiles.com/files/1177347/wwe_2k18_universe_mode_roster_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369671/normal_5ff5649e4044e.pdfIn PDF document text
    • https://kakakirikixego.weebly.com/uploads/1/3/4/3/134318951/kubusukojaxopata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8fa3725acbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/vedibavov.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/android_nintendo_ds_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/50010041695.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/english_writing_sheets_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/jixixe.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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 5368 bytes
SHA-256: 3f427962c2ec130d565c544ca8ad94b5f5f44190f575874ad1526045a84afca4
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 11784 bytes
SHA-256: c34c9a51b32fca0f3cb847bcab4eba0e34527ad5b5ba39a4cff0fa6a91a953bc

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