Malicious PDF — malware analysis report

Static analysis result for SHA-256 5057a43e6ebe3309…

MALICIOUS

PDF

77.4 KB Created: 2020-11-18 03:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c283efdbe97cfab927faac929093545f SHA-1: 8a2105145e2430a47ecb607a392a2744bd3ae530 SHA-256: 5057a43e6ebe3309df04b0e1ba96f9d3e772574af6193b065c358eec0b7df704
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one specifically pointing to `https://traffnew.ru/strik?utm_term=mechanics+of+materials+5th+edition`, suggesting a phishing or malware distribution attempt. The presence of numerous other PDF links also indicates a potential link farm for SEO manipulation or further malicious redirection.

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://traffnew.ru/strik?utm_term=mechanics+of+materials+5th+edition PDF link annotation
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/1740275.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/mamibekikikewajop.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/sepawi/93487902103.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/aqua_affinity_in_minecraft_the_enchantment.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/wikipedia_naruto_episode_list.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/instant_pot_porcupine_meatballs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cb89e8-fdfd-41b0-a4e2-4f93ed1f03bf/22719287910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b6240-43c2-4347-a335-b0fa3f251f82/sleigh_ride_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1efd38c-2cfc-4e30-a3cc-f844d3ddba9c/divergent_epilogue_we_can_be_mended.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256b0b69-6f1d-4ed0-b995-57e98dd84f77/pezisajax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d1f203-e371-4f12-bf7f-81eb337387dd/midozerijekumukazemo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/wobirulokizugirukuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b70157-5254-439d-921e-d3258e8d5ebc/84237207159.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/zapavetoke.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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5392 bytes
SHA-256: 27ba6338952050f69b91482d2a80de1be6f03f4a8d15229c9545ef524b43b144
font_01_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10784 bytes
SHA-256: e10e1e0d683b9acc43114a89908cf83badf1f3c9cc61960e22b5015ddba953e1

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