Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f89c1f0069bd3c…

MALICIOUS

PDF

96.8 KB Created: 2021-03-22 09:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9e32e728287ed49b8343c664de861be7 SHA-1: 36d7325f1a609aad9acae59a3a9d7cb0150dba54 SHA-256: d8f89c1f0069bd3c08a06746ffd5ea9ad053dffc393b3159050dde5ffbd6f8d1
194 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to mimic search results, specifically for a book download, which is a common lure for phishing or malware distribution. Heuristics indicate a high number of external links, many hosted on disposable domains, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=deepak+chopra+ageless+body+timeless+mind+pdf+free+download PDF link annotation
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/5239405.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/kikimaze.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/jiwunisuposodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_5fd671527b7c5.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/5349729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601dbe92559f3.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/07985.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/9YDiaha/contour_ez_meter_test_strips.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/icwzzni/large_yellow_apple_calories.pdfIn PDF document text
    • http://presentinsta.online/mp4_free_downloadu9ira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_6006fbaaa9859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fd1b90cc7e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/kjiiicB/street_basketball_association_unlimited_coins_apk.pdfIn PDF document text
    • http://momentshop.space/netgear_n600_modem_router_price8fznz.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/gTtYcgO/66942035280.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/lWhgpjy/33640066031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_74f914e0d87e4445b98db96545f77111.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_96a2c73b25804634bb682acdf2161825.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_702e7239aca04a4696b5d226b74bfbbe.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_0b269a6a83504c50bb581f80ba369ac0.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_677852ab40ca4a0bac211c9722615004.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 5752 bytes
SHA-256: c080d3a2cc6bb016099d248e9b4ea51bfa0b6eb0857cbd7fec10c26a4c7e7212
font_01_sfnt_off00013f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F22 12076 bytes
SHA-256: 97ecb142dc4cea1fbbe2743c3a46ae270f49bce55da62647e3d4e578a7923888
font_02_sfnt_off0001676b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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