Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b27c8ee9e74aba…

MALICIOUS

PDF

97.0 KB Created: 2021-06-15 11:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 58ba6e3a19d9157101c5853649babcda SHA-1: 6fad9c76b4359399e56cd11271d3356417897a25 SHA-256: 75b27c8ee9e74abaa6577a0838c189675ea29ebbf206d21c643e6fbb6ab68cbe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a malicious phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://synerhu.ru/pbw?utm_term=meet+the+spartans+torrent+magnet PDF link annotation
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/95ead63d081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_6023c14fde920.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/5551147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_60c48bb8e1e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_604fbec4f3eee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144604239/13415707104.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/24203661021.pdfIn PDF document text
    • http://rotulenixal.pbworks.com/w/file/fetch/145008417/sapaxosutoluzuvumuk.pdfIn PDF document text
    • http://vazufatar.pbworks.com/f/cual_es_la_diferencia_fisica_clasica_y_moderna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6dd4aa-9ac4-4a4f-9072-4bb4fcab497c/summary_of_three_questions_class_7_in_english.pdfIn PDF document text
    • http://negekovav.pbworks.com/w/file/fetch/145032684/id_hack_free_fire_apk.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/cardfight_vanguard_area_apk_download.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/45057797653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f1f376-c33c-4fe4-802c-c147df4c2d85/93303195868.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/145315611/56546763304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5b5f45-346c-4a36-b421-0e244af07af9/the_story_of_odysseus_and_the_sirens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb8a1eb-c958-4e6d-a012-f7304b29de00/vojamagutuvezajebafedoro.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/1793155256.pdfIn PDF document text
    • http://varulemenel.pbworks.com/w/file/fetch/145120899/90274609120.pdfIn PDF document text
    • http://votefiruri.pbworks.com/f/gudachari_torrent_magnet.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_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 5204 bytes
SHA-256: 9eccd52e8d0ef142dc5c51d5ded44821dc27439e02b2f6add2c2e7387b847fb2
font_01_sfnt_off00014996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14996 13548 bytes
SHA-256: 83a2abf5781b3aec9b7d2e5bd84ff49a43539baaf73dfbd72f9d92b979cdddf0

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