Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd48cb0fa51e407f…

MALICIOUS

PDF

116.2 KB Created: 2021-03-08 05:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 158e32b21867a9f95cf50029ae27f87b SHA-1: ca26ceb3afde7f1b50ace0107a45d30ddd9e45a5 SHA-256: bd48cb0fa51e407f83e971df4646c9d7cbdf25ccb7a695334359dc1155699042
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=where+do+ethnologists+believe+the+navajos+originate+from PDF link annotation
    • http://liolika-rsya.ru/battery_saver_pro_apk_freec9dm1.pdfIn PDF document text
    • http://brumbum2.xyz/pemulinefapewejeqhnms.pdfIn PDF document text
    • http://asta-stroy.ru/paxusulakepuvirudizv41m.pdfIn PDF document text
    • http://3203epworthcres.com/pitosexovozepukejed3n4no.pdfIn PDF document text
    • http://ketrovk.xyz/income_statement_and_balance_sheet_template_excelj7fnz.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/jbiegiN/piupiu._io_battle_of_tanks.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/iBvIMji/spacex_launch_live_bbc_news.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/hegcidr/hot_wheels_ultimate_track_set_highway_35.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/icgiijd/torukomazapumake.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/u8Nhejb/cnc_router_parts_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/edhigif/fastest_bowling_in_cricket_history.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/fhgggDG/fixusupidos.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/bia00id/puppy_runny_poop_after_worming.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/02gdggd/53933995853.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/kodipopujufipig/bloodstained_trophy_guide_and_roadmap.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_bd0abd4c83f74bff89f34ea448a02ce4.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_d0574306c1cc443386307349cb6307fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogonof/zogovexivumave.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_6f2f9f5e022740c488cded6591ed69b5.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_cbe894430d4e4ae7baa96c60f0e745e2.pdf?index=trueIn 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_off00017bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB6 2888 bytes
SHA-256: ba2356565adfbad3bce05071f499e58eec20abd0a5d273d6699ec2874c27599c
font_01_sfnt_off000185f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F9 5612 bytes
SHA-256: 1ae1e9133481752c9c1fc266ea02d6a259af673d1a554c774ac5be13a9a06936
font_02_sfnt_off00019903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19903 12692 bytes
SHA-256: fd4b953793f75c19ed1a8182cb45aad65c3ea047b95192a09894d31b6c2e50d7