Malicious PDF — malware analysis report

Static analysis result for SHA-256 37be6539b8d5c2ba…

MALICIOUS

PDF

71.7 KB Created: 2021-06-15 11:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f14a904c533d6215a911eb25f0357bc SHA-1: da126bed25b2391066be49f30965a879551a6b63 SHA-256: 37be6539b8d5c2baba35b2ed2da6401a53b926fed640bcfa534405e47cd77f81
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/pbw?utm_term=gta+san+andreas+free+download+for+pc+windows+8.1
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff431a6ca7cb.pdf
    • https://cdn-cms.f-static.net/uploads/4471995/normal_5fe789604a14a.pdf
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601448f0f0edc.pdf
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5feda4b4bc6a8.pdf
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/bavegetisuwiv.pdf
    • https://static.s123-cdn-static-d.com/uploads/4390366/normal_60b6cd68c24e7.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_603c74646c41d.pdf
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5fe6b3ea037d6.pdf
    • https://jesakejijubew.weebly.com/uploads/1/3/4/5/134577011/1205957.pdf
    • https://static.s123-cdn-static.com/uploads/4393362/normal_600348a0693e4.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_60642aba1781e.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6054f3615f93f.pdf
    • https://cdn-cms.f-static.net/uploads/4384039/normal_6048eab3a540b.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_60bb646e47dae.pdf
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/babusesonedu-zinogef-sedejukuguxof.pdf
    • https://cdn-cms.f-static.net/uploads/4375088/normal_60c753ac334da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sujagajo.pbworks.com/w/file/fetch/144496812/25376025681.pdf
    • http://kejufavo.pbworks.com/w/file/fetch/145182369/29513257173.pdf
    • http://vimadutukad.pbworks.com/w/file/fetch/144440253/how_to_get_mods_on_minecraft_xbox_one_edition_without_computer.pdf
    • http://vimakisarow.pbworks.com/w/file/fetch/145231914/ratchasan_full_movie_download.pdf
    • http://sufizilofab.pbworks.com/w/file/fetch/144680868/fugeruxugedu.pdf
    • http://redejok.pbworks.com/f/domom.pdf
    • http://gujavitax.pbworks.com/f/the_woman_warrior_chapter_1.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_off0000dada.bin
6d4ddb5f48e94fb869687981bda2754f5ddb11ae4c6442ee4b15fba7c167fad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 5552 bytes
font_01_sfnt_off0000edf3.bin
f76082ed97be36481ff45b68e36cb6d9dc086dac1c568ef88589e66f19d9a457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10400 bytes

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