Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f68b6f090edad1c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 21:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d3795db577b41296de6f5d080fb5b835 SHA-1: ffeeba6f0d3585d26508cca0345508c6503e1502 SHA-256: 4f68b6f090edad1ccf0882adff9279ccc79da1f919a2edc3a106ef24b4e8d3c5
246 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing campaign impersonating USPS. It contains a large number of external links, many pointing to disposable hosting, designed to create an SEO link farm. The primary lure appears to be a fake USPS delivery notification, directing users to a redirector URL that ultimately leads to a PDF hosted on weebly.com, likely to harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zugudomumomaxix.weebly.com/uploads/1/3/5/3/135324912/1aebf42de.pdf.
  • 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://mezovuduw.ru/wix?keyword=letters+that+start+with+g PDF link annotation
    • https://cdn.sqhk.co/pixafosabow/Ihhg7gj/vekuzumogimebak.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/dahcgdH/vanilla_cake_recipe_moist_allrecipes.pdfIn PDF document text
    • https://zugudomumomaxix.weebly.com/uploads/1/3/5/3/135324912/1aebf42de.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/fmigjja/stick_it_movie_soundtrack.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/3848897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_600281669417f.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/4614263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600bf43b55f80.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/mozegejujoso-xirasudi-womalatadoku.pdfIn PDF document text
    • https://gutirevenomosub.weebly.com/uploads/1/3/5/4/135400373/f9f576e3.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/hfgeWni/blackfoot_motosports_phone_number.pdfIn PDF document text
    • http://lutusogugifuj.iblogger.org/what_is_freedom_for_you_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/S5Mfbhg/juguvip.pdfIn PDF document text
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/kamifibo-xufenuma-paxamok-wanajut.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/1344036.pdfIn PDF document text
    • http://zajowidased.iblogger.org/57062196262.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/98c9f73138a.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/ripakiwenewa.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/6ffa5a0c4e.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
    • http://texokobatogu.epizy.com/network_topology_definition_and_types.pdfIn PDF document text
    • http://leralobov.epizy.com/us_navy_seals_combat_uniform.pdfIn PDF document text
    • http://wafovekideg.rf.gd/fifty_shades_freed_trailer_2017_in_hindi.pdfIn PDF document text
    • http://wosepejodobedaf.epizy.com/cg_full_movie_website.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 4520 bytes
SHA-256: cf08511157f9bc4217c5a21a8f7597e6bc9cf219776bc436c083a1e60a636be0
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 12728 bytes
SHA-256: 2dbb0551b4667db36fe6da518933538974bb522434c71fccd3d1ebd4b27066ed
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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