Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6471b6d394337cc…

MALICIOUS

PDF

83.2 KB Created: 2021-02-17 05:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c82f44156c2363e6b1278e999b6e588 SHA-1: c2b8e6c70cb22d083ff7b27ae451091886c6d2d5 SHA-256: e6471b6d394337ccf352d38345f3221e8e589691899fd04158f087d882fe03e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The primary URL, 'https://baarspo.ru/strik?utm_term=maytag+4000+series+washer+parts', suggests a lure related to appliance parts. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for traffic redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=maytag+4000+series+washer+parts PDF link annotation
    • http://vedibekupuviru.iblogger.org/android_10_xiaomi_mi_a2_lite.pdfIn PDF document text
    • https://gelixilononusi.weebly.com/uploads/1/3/0/7/130775878/luwegamajeg-dojiwepajis.pdfIn PDF document text
    • https://vifaseberafu.weebly.com/uploads/1/3/0/9/130969816/6419191.pdfIn PDF document text
    • https://zulaxavon.weebly.com/uploads/1/3/2/6/132695675/savuwedokuman-dixurefijumaf-zibaxafojimode-lugofi.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/ccfc5910f55ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fd0785be2393.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/tavugofufesa.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hiFuNid/fibum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5fdbd7cf59ec3.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/figovuz-zaviwaged.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/adrianna_papell_dress_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/35214825127.pdfIn PDF document text
    • http://tekobisami.rf.gd/bafininebidezusinajiga.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/povexopiziv.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_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 5480 bytes
SHA-256: 5544fb0bb4cde18f9322fc67129cea28e2b685bc7e47c1c4a9a5ae6d60114e5c
font_01_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 11304 bytes
SHA-256: 4f89aa1f7720ac7823120f03f83c16b376399df8ca81695d39d70faeaf10592b

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