Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a34d1406b1aa2e…

MALICIOUS

PDF

75.4 KB Created: 2021-03-07 13:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ee7e40ebae26974c69cb95da49a10e23 SHA-1: 9c4032e9c07cdb6dd6f3c0040d11e52aced0a083 SHA-256: f9a34d1406b1aa2e87cab7bd409fe508b564f7b0e871f65ad4c0fa10a77db293
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm, with one prominent URL suggesting a lure for downloading MP3s. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The embedded links and the nature of the content suggest an attempt to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

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://xezojetit.ru/wix?keyword=ace+hood+download+mp3 PDF link annotation
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/837609.pdfIn PDF document text
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/zalapezixiso.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/sarah_plain_and_tall_series.pdfIn PDF document text
    • http://mishgen.com/mercury_7.5_hp_outboard_owners_manual6ctcx.pdfIn PDF document text
    • https://sadusanolomu.weebly.com/uploads/1/3/4/6/134646393/448d54b14ccc.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/97664242749.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/sosadesudejabiw.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/7876318.pdfIn PDF document text
    • http://olymp-trade.top/what_are_some_of_the_different_types_of_sculpturesat03.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/is_bostitch_drill_a_good_brand.pdfIn PDF document text
    • http://it50save.info/describing_graphs_vocabulary3tr0g.pdfIn PDF document text
    • http://leafester.online/what_are_the_rules_for_a_learners_permit_in_floridaiopkv.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/6651620.pdfIn PDF document text
    • https://sesuxaned.weebly.com/uploads/1/3/5/3/135349378/f2e23dabaeefd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumubagigafaj.rf.gd/15676564445.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_445827d52c7f4f1c9fc4b8fb3db4fe17.pdf?index=trueIn PDF document text
    • http://pifixoga.epizy.com/chrome_32bit_windows_8.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_d1de29749eb64096be5ce05b7f11eb72.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_e5e89f52d7584ca48835a6fdeb312909.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/geotechnical_engineering_salary_nz.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5284 bytes
SHA-256: 7fc1ba5bba1a70e293db3dc535e1846201a2d670444a4ac24467191d42be7de7
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 15948 bytes
SHA-256: 7f02ec1cd3996fc04db43e908e2d709af66f7beb017823551ae58bcac994fed6

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