Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c4dab285c2cd6…

MALICIOUS

PDF

70.6 KB Created: 2021-04-13 13:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c01f7b75d407b835e285ba35005570c0 SHA-1: 23142a42dc842e4cb89cafcbe4d8dadf51f2b71b SHA-256: 4c7c4dab285c2cd6857c54f8772982c3c907132470a54b73a0d794f22f369b63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure or a distribution point for further malicious activity.

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://zajinet.ru/strik?utm_term=mass+effect+3+prima+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407780/normal_6055448b90bb2.pdfIn PDF document text
    • http://123dutch.com/encyclopdie_des_plantes_vivaceshboyl.pdfIn PDF document text
    • http://swiss-gear.shop/sat_subject_test_math_level_2_score_calculator36s2x.pdfIn PDF document text
    • http://my-favshopg.online/how_to_plan_your_life_with_adhdztrml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_60484fa6ec94e.pdfIn PDF document text
    • http://tajuliwelofiti.medianewsonline.com/gps_antenna_design.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/acute_abdominal_pain_differential_diagnosis.pdfIn PDF document text
    • http://cosmostil.top/28083865494ujha4.pdfIn PDF document text
    • http://test123test.xyz/how_to_use_an_embroidery_machine_for_beginners59ony.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_60527f0a456e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6009b292997aa.pdfIn PDF document text
    • http://swiss-gear.shop/how_to_reset_samsung_fridge_freezer_displayugyw1.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/rodakarugupoko/age_of_sigmar_releases.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/vazowalivunabogape.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_3d2a6126d68f4dd595a5d8c364d3b692.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laradusa/cyber_hunter_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/puxaziguguparagibi.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_fecb1a1d9ed54adcaaeb0fe5016bca6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/zupudar.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 5612 bytes
SHA-256: 9068c97231ccbf0d2dc4a77bb804816c815730fa6df5d30140af812d4aa00386
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 11852 bytes
SHA-256: 26f942fabb7eaffcbd73ce4ee81af13a8105ebbc7ecfb7f909280e5b5f9abb62

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