Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4ecdf9fca3edeb…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 02:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f341dc4ef7cdde77603f0ff116a79684 SHA-1: 140259993018c56955c04ac426d27c7397bce0ec SHA-256: 7c4ecdf9fca3edeb6cffe0fc525ccd4460ec28a117528d18ae1ff6568be9c250
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed for SEO manipulation or to redirect users to malicious sites. The embedded URLs and the heuristic firings strongly suggest the primary goal is to drive traffic to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+do+you+fix+a+whirlpool+refrigerator+that+is+not+cooling PDF link annotation
    • https://cdn.sqhk.co/mepapogivoma/ezn2UlW/14738208633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425760/normal_5fe57cea85a56.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/ghjPP1V/army_prt_mmd1_acronym.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/KjaljcS/bloom_s_taxonomy_psychomotor_verbs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/jjg8hc0/heart_break_wallpaper_download.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/rerufafovow_ravabure_zoloxubidapu.pdfIn PDF document text
    • https://nolegajaji.weebly.com/uploads/1/3/4/5/134519786/7493950.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/xepuzituvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5ff6651d4707f.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/4083539.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/oedipus_rex_full_text_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/igggmqo/bengali_voice_typing_keyboard_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_602e661cbce6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_603380fbc9339.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/4f9d40c5541a119.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/wogikokuzotaxa/48635865247.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/formal_email_to_professor_template.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/55351538489.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/can_i_plug_my_headphones_into_my_xbox_one_controller.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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 5640 bytes
SHA-256: 166b047b2600c3a8d07b308f9c66c6dc2668c54879cee07a035c52b9f7ea1215
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10868 bytes
SHA-256: bfe354dcf4fdb336ca6052ff3373fc3dc31f19f6888e0802809536fab3577153

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