Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73ff50686c6e975…

MALICIOUS

PDF

78.1 KB Created: 2021-05-11 20:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1904fabce1d8609796985bfae4dc71da SHA-1: 219db22a8f2282a7cbf33efc1298e190302b92e9 SHA-256: e73ff50686c6e975234fc18ad6d386d7f6ef1cacb5780fd8a330e52c7d1134d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One URL, 'https://gimoguvi.ru/strik?utm_term=the+collector+book+summary', appears to be a redirector, potentially leading to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=the+collector+book+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444356/normal_600b09b821885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_6043133b3de0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fdba21fc8a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_60431016adddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60175f448d59f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_5fe73f18cab67.pdfIn PDF document text
    • http://bovozewoxif.22web.org/advanced_algorithms_computer_science.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vitewunidamol.epizy.com/database_administrator_interview_questions.pdfIn PDF document text
    • http://nimunofat.epizy.com/argumentative_essay_topics_2020.pdfIn PDF document text
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_60d8b3ae594d4209ae0a7fa4be9dd6b9.pdf?index=trueIn PDF document text
    • http://tukakuze.epizy.com/lituketolufejimilidurad.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/craftsman_leaf_blower_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/16985938425.pdfIn PDF document text
    • http://tituroxir.rf.gd/march_madness_bracket_template.pdfIn PDF document text
    • http://nerepigov.rf.gd/cost_accounting_for_dummies_cheat_sheet.pdfIn PDF document text
    • http://zoxuwabemowel.epizy.com/6634924456.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_13688b406a9b4540aa9a711416bf7e19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/wafaso.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/xiwijulujebubu.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_3510ea228af94a12bcace57c61c6c819.pdf?index=trueIn PDF document text
    • http://renebizokav.epizy.com/70801950770.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 5296 bytes
SHA-256: 7ddcc9b64bbd5ec74c57481415d9ac7d70f0e299211e07d14c666c2cb9f7860f
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 10988 bytes
SHA-256: 4a6b0b394baecc54fde0e89060d898cc4c25a9a3db915e75e69ac48b3ca72bf8

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