Malicious PDF — malware analysis report

Static analysis result for SHA-256 d140bc5385e6e386…

MALICIOUS

PDF

86.0 KB Created: 2021-02-19 03:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ba6fcce6b668dda3fabda6ca93fe74b SHA-1: 55ef882c33c3bb631c55278c9756cbb6cea45fe2 SHA-256: d140bc5385e6e386c371a2b1e6195bef7d4336ff9c78c211970c5e1a5d180a0f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing further malware. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=the+3+g%2527s+chicago+pd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5ffaabdf8ee77.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/grizzly_bear_a_simple_answer_lyrics_meaning.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/701168.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/1056625.pdfIn PDF document text
    • https://puzubogo.weebly.com/uploads/1/3/1/0/131070381/xowilifubad_xofabegirodo_kifemi.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/8932467.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/4fdd1a1e2cea1b.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/arraylist_vs_list_performance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5fe8025d57e12.pdfIn PDF document text
    • http://raisinshub.club/87165869156lrfnr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff41d2d7af7b.pdfIn PDF document text
    • http://excschool.ru/xamilixikorazudmm1ip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6541149402.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/nekifefineju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwefijegiv.epizy.com/ancient_greek_roman_byzantine_costume.pdfIn PDF document text
    • http://vepuziv.epizy.com/alpe_d_huez_ski_guide.pdfIn PDF document text
    • http://totofexux.epizy.com/software_requirements_gap_analysis_template.pdfIn PDF document text
    • http://lugelugadafutes.rf.gd/zuwopibivixex.pdfIn PDF document text
    • http://votitagupen.epizy.com/kuwodikulosagixexut.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/romivodokugosimid.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_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 5352 bytes
SHA-256: 7da10f934a36a73caf8043a11d67a9d2cb551d1673428b1627d8c858454ce926
font_01_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 10564 bytes
SHA-256: 0f9a04b0dfbaf547f86f757c415a0102c8714ebedc4a9f95182d4b888a92c90d

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