Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b391bdf99c326c6…

MALICIOUS

PDF

68.5 KB Created: 2020-12-23 06:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31ed0392a1a32254dddfc46ff3f76cb8 SHA-1: efad243ce41d4920628252bb6b4b6191527be465 SHA-256: 7b391bdf99c326c655eeee4a1fdf5804836d0268a47e570b80f7ce55f48dc0ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'trending videos'. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to drive traffic to malicious or SEO-manipulated sites, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=trending+videos+2020+in+facebook PDF link annotation
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/kuxupedafu-fasatilinuba-novinaz-luvezikuxuzoto.pdfIn PDF document text
    • https://raralafelu.weebly.com/uploads/1/3/4/4/134476833/kezam.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/3199702.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/7a5da070771.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/xevelajilure_foburobixisowiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fcf21b80382f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8151ac7e22a65153ef0/t/5fdcc1f77ff8e90c280160b6/1608303096775/american_sniper_tamil_dubbed_movie_isaimini.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5707e1c8c741314508ea2/t/5fc8ca9be101942bf7790b8a/1606994589243/ahlamalik_williams_y_madonna.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7a3b0a190b16b315946c/t/5fdcfe2e8112e553a64ebb70/1608318511611/29335743822.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51cce8139af03766060b3/t/5fd1db2b7c12252903f5bb30/1607588652587/fun_race_3d_online_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd13a59-1e5b-451c-9f69-41f0d0fef232/timud.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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 5644 bytes
SHA-256: 471dfaba932108728bcf2ccd47848030edc19b454cde06c244f1c88a534eac9f
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 10528 bytes
SHA-256: 6e806e91f64f483dfca9199df2823ed9aa736fb2b9e20e66477a8bed4550f429

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