Malicious PDF — malware analysis report

Static analysis result for SHA-256 34df10a587e6c22e…

MALICIOUS

PDF

85.7 KB Created: 2021-04-21 14:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fc098e9f38dbf5d0a113a5262b490925 SHA-1: 52b92a31cd84dce1950c43260f5fd24e2bfa7ecd SHA-256: 34df10a587e6c22ee2caef03b7414254d02e14da6175f516a8db7d35c26a54af
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'how to change the belt on a hoover dual power max', likely to trick users into clicking malicious links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports a malicious intent to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+change+the+belt+on+a+hoover+dual+power+max PDF link annotation
    • http://mawujakow.iblogger.org/76646418151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_605014e28d014.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ih1haee/4206946683.pdfIn PDF document text
    • http://dekabizutetan.22web.org/zumoxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gajamomol/xih0aid/kutagowabuvukatene.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/hcijGge/67412651517.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/7RdicJo/57649306764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fd678b62455f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulilemol.epizy.com/ap_calculus_textbook_download.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/83900890699.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/acorn_superglide_120_instructions.pdfIn PDF document text
    • http://givovuzozej.rf.gd/rpg_maker_xp_pokemon_android.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/74921460378.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/56868704595.pdfIn PDF document text
    • http://sutepaxevak.epizy.com/william_blake_the_lamb_symbolism.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/sivapitilanexekilirofux.pdfIn PDF document text
    • http://gulodubulita.rf.gd/riesgos_de_trabajo_unam.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/jagesexavedejotuti.pdfIn PDF document text
    • http://gebogozomusedom.rf.gd/77901831573.pdfIn PDF document text
    • http://kabumosubeno.epizy.com/98682029629.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_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 5628 bytes
SHA-256: 07a789e3ae342ad637e5762cafaef60a975ced9ab338bed53dcdd811d915ebc1
font_01_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 13172 bytes
SHA-256: 3c7201880b0b62d4c47a159b848ef7d3cdf9fbdd1037f4f8ac12e97553e6b378

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