Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd68c5ac4ca4c22…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 18:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a8c09b9fa90aa0c81aa0c32026c64e0 SHA-1: 7ff48d1d650b7d4fa26b4988c73e52b156e67f34 SHA-256: 5dd68c5ac4ca4c22c6fc628ad0523308bd8046e91e72931f1484e04868051964
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary lure URL, 'https://jumiwimov.ru/123?utm_term=best+voice+recorder+for+android+free', suggests a phishing or malware download attempt disguised as a free software offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/123?utm_term=best+voice+recorder+for+android+free PDF link annotation
    • http://rm-swis-mine.com/how_to_fix_an_unbalanced_washing_machine_drumgbvmb.pdfIn PDF document text
    • http://bella24.xyz/verizon_wireless_mifi_unlimited_planldm8o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807899e044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_5fdf925fa6f9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_60049a7c80709.pdfIn PDF document text
    • http://wdd13.ru/fraction_pictionary_cardslsmyu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_6004c3aa2dd33.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/genijusemu/56144356506.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/63494187318.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/magefomisoj.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_e67a5f851fc14081b7b001ec5ede02ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49324cd-99fb-4c92-a6a1-5884cdfb640f/how_to_write_a_medical_case_study_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad99224a-d963-46cc-bdda-3119b05bdf0a/85439098317.pdfIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_f2969de4b74d4079bece940f877323d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf85617-aa0d-4e8c-aefc-3c769ba47d83/john_deere_726_snowblower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a1931a-b5be-47f9-9713-971c907dce00/lutog.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_eb5e50fd9a504df6b032b2ed8dbea8b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/hereditary_cavernous_malformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c3c2d-fdfc-4fcb-9e04-60fc67c3f2d3/where_to_donate_toys_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/72350022646.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 4880 bytes
SHA-256: e2255d5b585f93e6974e424d5158343617de5fdfc2982b63df64c1f7f5ec7338
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10940 bytes
SHA-256: 23f1e6fdde9e442a35b043ac3928ce089c05b0b9e33555c007614bee1c5f4886
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378