Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a49d316ac1bbd8…

MALICIOUS

PDF

71.3 KB Created: 2021-04-05 15:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede064807ab2b79cb10980509c47f1d1 SHA-1: 26b1e7a9948c6b6a45a4bc4517314c9e0775f55b SHA-256: a2a49d316ac1bbd8a052b658b0c8b3eec879848eaa6ac157088e30a47591dfb4
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=nerf+modulus+recon+mk2+mod+guide
    • http://lefefegibilapo.22web.org/julian_calendar_excel_spreadsheet.pdf
    • https://cdn.sqhk.co/sarowojep/YH4QIok/pixel_army_base_shooter_mining.pdf
    • https://cdn.sqhk.co/romumoxoleno/tlhf6hd/18206419634.pdf
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/9458757.pdf
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/lubijovitu-fetubokinifebuf.pdf
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/menuwuvoz-dunaf-gazixurevija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibedob.rf.gd/2598226357.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_c8b7c98482ba46a694dd67f8d60f4e3e.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_4ef793c143ac4cc199925b6db7d434bb.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_3aba90d072314bb4ba8f78ba4d402e2e.pdf?index=true
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_f6f5744869b4477cbd4cc0d30ec6b420.pdf?index=true
    • http://bakutogigu.rf.gd/background_music_app_for_android.pdf
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_9d0690fe5b434c84a36352f63c4940a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d34284b7-af4b-4645-830d-098dab9376d5/dds_discount_near_me_store.pdf
    • https://uploads.strikinglycdn.com/files/c7014d30-cfad-4388-8b31-700e96f108dd/how_to_wash_an_uppababy_vista_seat.pdf
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_a998f003651649098a1dd1ce82011a4a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a9.bin
a753cc29e2896592729e648f08f775a08742952e349f1299e650fa3613d31b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 5296 bytes
font_01_sfnt_off0000eaaa.bin
36cf9e1db075bcdf4feb29fa0b567e47180ad94edea37bcc9d3edd8799043451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 11076 bytes

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