Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a893685d08c01a7…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 01:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c11d865ab4addebdd3bc6df8ac86f4 SHA-1: 504500b8d0196cf505f0b96e6c69522461cd854b SHA-256: 7a893685d08c01a75959b87714df7352566fe1615133b2cf6414923dfc47b47b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on suspicious domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and ClamAV detection confirms its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=the+sims+freeplay+quest+guide
    • http://menbp.online/99757661163zwgmw.pdf
    • http://idealslimitalia-oficial.site/gusset_envelope_templatec2hq8.pdf
    • http://4gusevshop.space/rafosukexaxob4e3c8.pdf
    • http://laulu-go.ru/6645817476150loq.pdf
    • http://gupirigugorixuf.sportsontheweb.net/4756435489.pdf
    • http://nopezimugabotik.mygamesonline.org/bescherelle_german.pdf
    • http://trafikcezaodebayisi.com/data_science_do_zero._primeiras_regras_com_o_pythonwyd5f.pdf
    • http://yesitalia.fun/aperturas_de_ajedrez6tw6q.pdf
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/gosegowokisafu.pdf
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/1435959.pdf
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/9721715.pdf
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/vegoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_9babbe1fbe2e47cbbd0f6c13bc8e7455.pdf?index=true
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_7275ba3bf72641f98489d9e079a50e8d.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_240b9b362a384e68b45487788d72e653.pdf?index=true
    • http://faleferesevo.onlinewebshop.net/ravunuv.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_462fb280448949948b2c9c5bd8528b54.pdf?index=true
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_206c622209694455a2cac87db734e7a7.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_0684722583814a569d21c9753432afcb.pdf?index=true
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_6d7cd84199704e04b801e31ba89b8f7d.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d587b76dd2fe4fb39f20b66bce78998d.pdf?index=true
    • http://wipibefab.onlinewebshop.net/dark_souls_series_bosses_ranked_by_difficulty.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_4418617db0fb4ca6af7d4618eecfceed.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_off000111fa.bin
e4a1e659c1af03a8a9fb09bcd7ea3acc979afd24abd95b3982cbaa2d6d8d01e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 5632 bytes
font_01_sfnt_off000124f6.bin
e74b2e8d12d71a8c2ef8bcc9c27ac58c23c73e5604cd9980914dbf7e387dc6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 11392 bytes

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