Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0abfd631408ac9…

MALICIOUS

PDF

88.5 KB Created: 2021-04-03 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 19e088108d6b25470e669ef737f3729f SHA-1: 52561ae56e9bc45b20640dcfb4b56636f5d9c60e SHA-256: 4b0abfd631408ac9260c48a1087821dc4cb2a0e3b031c99ac0dd34c6402665b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=shock+sepsis+adalah+pdf PDF link annotation
    • https://cdn.sqhk.co/vutexexukus/ChcegjW/rewenebemudatomebozakow.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/eiijgvl/23447699036.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/jphhJlm/smart_applock_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jjigB5T/editable_shopping_list_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/LHiIhie/kiderenewifodudovopovuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5ff4fe719e0a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_6001cef793d1c.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/jhS9JDG/57350644375.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/9oLjfRc/sagiripevexajana.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/dKjjtjb/snake_eyes_dice_tattoo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/MEiiTgi/ninja_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/hfcnggV/asteroid_radar_live.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/xapota/how_to_do_citation_in_word_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4aea61-a189-4f48-b5bc-d3a94c968e84/la_amortajada_mara_luisa_bombal.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_d58a5f5aef20452bada3e1a5a4975cea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ad8f9-bbaf-438a-bcb1-2cdbe88548e1/woletuxifetufoxivovumap.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_0abfb6f36b8d45998247e0a93e954b8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c46553a-c652-419d-8d30-491e5a956fd3/vobozinuludare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32592f93-9c2d-4e65-b34b-f45506c4494e/81849340947.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/porukiwekibevobiropi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867a45fe-80ac-4b78-acee-d74cc533b8a6/rudavedusa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 5312 bytes
SHA-256: cb55ad4cacf54452c2915b111372b162cfb6693a8f9c0846a071dc31dbd522be
font_01_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 10788 bytes
SHA-256: 579ddd9ef6256708c16cdfdfc6751a40b240e7395685def044db77397fd9f697

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