Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0156e861d1dc146…

MALICIOUS

PDF

139.4 KB Created: 2021-05-21 13:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c53505c076f4c17fb194b847f0f716 SHA-1: 2f857822653b343a3e4f2452172e198d8368664c SHA-256: b0156e861d1dc1468dd5581a4c226c912a1521f39a0d19b9e5d0b9878514702b
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 designed to redirect users. The presence of a URL with a 'free hearthstone packs codes 2019' UTM term indicates a lure for potentially valuable in-game items. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=free+hearthstone+packs+codes+2019
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/9a9d4eea722d6e9.pdf
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/9e730dcdd2c339.pdf
    • https://cdn-cms.f-static.net/uploads/4388426/normal_604b3fd365092.pdf
    • https://ratilobavet.weebly.com/uploads/1/3/1/8/131858747/35e722.pdf
    • https://xibulifi.weebly.com/uploads/1/3/4/5/134509251/3793005.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffd0d948934e.pdf
    • https://pemolodubi.weebly.com/uploads/1/3/6/0/136052155/9998681.pdf
    • https://nemamalalebu.weebly.com/uploads/1/3/4/3/134357173/5856986.pdf
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/kokekiw.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/juwowatis-pazalopojub-narutaxomegif-kejusifop.pdf
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/9278724.pdf
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/642ac4f774572c.pdf
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/nefomuxasumavejimozo.pdf
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/6812738.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/85d9bec4ae.pdf
    • https://static.s123-cdn-static.com/uploads/4370280/normal_600260df78347.pdf
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ffdac607a088.pdf
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/nunozevozi.pdf
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/4433962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/976be3e3-f017-4125-a27c-45cb2ce115e2/lapewobutavonosaler.pdf
    • https://uploads.strikinglycdn.com/files/f7d1f5bf-90f0-4bcf-9857-19c33550eda1/verosexaluxelonubodimiz.pdf
    • https://uploads.strikinglycdn.com/files/a009455f-2a49-4ebe-8a7f-b0044741141f/zejelivojeniruxidox.pdf
    • https://uploads.strikinglycdn.com/files/ffa5ccf7-9f95-460b-9829-199003e09938/how_much_does_it_cost_for_a_lawyer_to_make_a_contract_in_south_africa.pdf
    • 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_off0001e2e9.bin
aa725396e0ea093bb5d81af1e9b3b530315b38e151d3e3dfc7c982b1133c2d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2E9 5632 bytes
font_01_sfnt_off0001f60a.bin
484258cae16af18a438848d5723392f97a49add620163c300307a92b72f4bdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F60A 12288 bytes

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