Malicious PDF — malware analysis report

Static analysis result for SHA-256 000586fbeb615471…

MALICIOUS

PDF

90.4 KB Created: 2021-06-06 18:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f1a0e6aee8619cf63120866da165c4d4 SHA-1: 8bd5702ad33ab36302d4109433bbfe8ffdf234f4 SHA-256: 000586fbeb6154714f9d75b321e4e8e00c91c426532155a48c74d5b04c5f7845
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a mass of external links, with one specific URL being `https://laborke.ru/pbw?utm_term=arabic+nasheed+mp3+free+download`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=arabic+nasheed+mp3+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457848/normal_602e9c7ea95f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603f33b79784f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_6019681b912b8.pdfIn PDF document text
    • https://vudivopaf.weebly.com/uploads/1/3/4/8/134876542/tajola.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/vejikodudelil.pdfIn PDF document text
    • https://sugemisikuwev.weebly.com/uploads/1/3/1/8/131856456/dawefobak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_605916c6f19f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_60358a593e270.pdfIn PDF document text
    • https://woveguzusozor.weebly.com/uploads/1/3/1/3/131383383/bipotokesaxumutijuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144722028/ditivukejisajasedusulukak.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144568017/what_is_the_best_blockchain_company_to_invest_in.pdfIn PDF document text
    • http://jabodawo.pbworks.com/f/what_is_similarity_attraction_theory.pdfIn PDF document text
    • http://likanegi.pbworks.com/f/minions_full_movie_online_dailymotion.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144432579/who_are_the_character_in_the_story_the_last_leaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ff27e0-0568-4b15-a91c-7ef6017e3142/ronunuxexadegogemobidesen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afe14d3-e770-48ed-8730-4e067983210e/tefuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dec30cb-439c-4cdd-bf88-51b66c11b629/58829826328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7dd0c9-3471-4852-a7f4-fc0770f39725/rezapolid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b0fce7-8626-4cdc-a9aa-31cc2a620bcd/kimojidaxopibibem.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/22586711391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80121d2d-7d83-4cce-bd51-296b6d82b524/joxanigupo.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144558480/gce_o_level_2020_timetable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8e2cd6-d319-45d8-ac0d-5c6c5999a2ab/siluvusilegoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4f040d-22bf-4dc0-bdfc-c5230f19ff96/xefaginukupadozupuvaxipud.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001374a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1374A 20460 bytes
SHA-256: 08fdce13098d998b3c93e7e17b828faae82de5786feec8d0f39f1e4d5ab4c8a4
font_00_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 3412 bytes
SHA-256: e95506355af6789866d706391a5376dfa8e8e10c712f535c993351d07d0d33d9
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 5780 bytes
SHA-256: c138b9d0ed8250e54bd2de49f228b53a904a913efe7428fb57e16d5ff007c2e6
font_02_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 13208 bytes
SHA-256: 241126c4a5b964f99e717cd1763f672a6ccdfd093da4fc64dab284c9973b4a3f