Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f0165a83b73777…

MALICIOUS

PDF

84.3 KB Created: 2021-02-08 02:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ed7aa144aeaffc805768a74a78378a77 SHA-1: b9fbc9502dcfaa77b63364700ef1fbb95b1ad386 SHA-256: 71f0165a83b73777ec78ec166a75d18c23cf96e1589c6fc7e3d9c85c3120efae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and one specific URL related to 'cyborgs heroes never die subtitles'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

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://bologen.ru/wb?keyword=cyborgs%20heroes%20never%20die%20subtitles PDF link annotation
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/8583924.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/bgeXcbO/zombie_horror_games_free_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/dhb3bAd/xawedapu.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/jhfQ3Ss/63194211553.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/rulegetolami.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/rugim.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/jbzjhgc/99450741409.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/Q0igFjj/83605494904.pdfIn PDF document text
    • https://sawifumoz.weebly.com/uploads/1/3/1/3/131380604/vilugazebut-ludinabapobolep.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/8553f6bf688012.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/hd9jahL/formula_1_drive_to_survive_season_2_review.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://s3.amazonaws.com/busutafitufe/wusuvupe.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/mcgraw_hill_answer_key_math_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/binomial_series_proof.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/3d_photo_editor_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/buwijuwewobuxonu.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/jifotaxamoxudofububu.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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 5084 bytes
SHA-256: 89da71cee8f7c2676a1705018730d25b84fa996f5a176adbf10cbc9522253f17
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10600 bytes
SHA-256: 48b1074160f29de939b76a445e8c345cedbfa4ca7213710e709b5c96a0520aa6
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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