Malicious PDF — malware analysis report

Static analysis result for SHA-256 34748395f398a9c8…

MALICIOUS

PDF

99.6 KB Created: 2021-03-29 11:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 29dd66567666941600d340cc8269c541 SHA-1: 62a1f29970245caa57983f7d8bd8a2faa085d736 SHA-256: 34748395f398a9c8099539637636bdc582d497d32e06e95e6a14aeb23591b2ca
186 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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=atomic+bomb+size+chart PDF link annotation
    • http://wajufogisabo.iblogger.org/xisiw.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/c677c7ab91.pdfIn PDF document text
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/kaketujope_kowovibojirin.pdfIn PDF document text
    • https://baduravimu.weebly.com/uploads/1/3/4/7/134713966/574ac4.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/kipajudegov.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/aLcCjd6/gafakufofiwenif.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/b4ae89.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/48898512382.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/6017797a8b5.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/90657815405.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/7418353.pdfIn PDF document text
    • http://pawosevisipe.iblogger.org/superhero_word_search_answers.pdfIn PDF document text
    • http://fisidijomufuto.22web.org/toeic_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vigamodijek/Siahgij/wogadaniwakovoniduwu.pdfIn PDF document text
    • https://nasovakuj.weebly.com/uploads/1/3/2/3/132303133/5999907.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/vT6Shib/favibibaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/IgiPggc/31074583600.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/44001369488.pdfIn PDF document text
    • https://cdn.sqhk.co/jinokazif/cOW9Cid/raxevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feramivo.rf.gd/punjabi_bhangra_dhol_remix.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3b132ac4372745ffb435e6c1a0f25580.pdf?index=trueIn PDF document text
    • http://volomuladifute.rf.gd/true_freezer_t-49-hc.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/jspdf_html_to_angular_6.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_ec65992a3a8d460dbbc77e0802bcc196.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_04bcd05f3e394300bf5e1cce02901ccb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001487f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487F 5188 bytes
SHA-256: 45e5db92c6de6373f87aa4167001b290a88bb62517c582be742a48ebdaf30249
font_01_sfnt_off00015a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A00 11372 bytes
SHA-256: 864d64609b2afd618a03a5aaff17aa28cf9088e6605164c521091b5a1ae68b5d