Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cc27a41f578a4a…

MALICIOUS

PDF

74.9 KB Created: 2021-05-09 08:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cc302a5dfe49aa2769ec5011355d51bb SHA-1: c7684537d1f1940cb4ed8242f39ddf508100c867 SHA-256: b4cc27a41f578a4a9fe862cb92b78e6db6d51dcd42d8595f923982524ae7623c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to interview advice, suggesting a lure to engage the user and direct them to malicious sites.

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://jumiwimov.ru/strik?utm_term=good+weaknesses+to+say+in+an+interview+reddit PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/hb30rSU/end_it_all_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/iRLijgi/loxujotavijowoj.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/4940a557f.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/53f1d9.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/1573184.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/rosujivu.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/ibeijQg/nafubufumunisawafopemut.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/gevisesobejijopatux.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/Sae7Qhf/colour_lightly_crossword_puzzle_clue.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/jusal.pdfIn PDF document text
    • https://kaxapanokatonab.weebly.com/uploads/1/3/1/0/131070327/1186438.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/ghjFjdD/oklahoma_unemployment_office.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/cc5ac4995a6de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefegasoro.epizy.com/dixuso.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/32562648833.pdfIn PDF document text
    • http://xugadizedema.rf.gd/bandpass_cracked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/determine_the_force_in_each_member_of_the_loaded_truss_chegg.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_5016020d8314407dba885dee035e857d.pdf?index=trueIn PDF document text
    • http://bafuxinasu.epizy.com/age_of_empires_2_setup.pdfIn PDF document text
    • http://nixipidulateva.rf.gd/rivebesesof.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_0ffba91b9dfa4b968a2b1a1fb7116031.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 5136 bytes
SHA-256: 593b62798e6573dc989da0374e7f892417888609feb5a8d462e17092818b1af1
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10584 bytes
SHA-256: 137741bd67462c98d79f4bdfc578cda4ed10f43b55a9d1678009ea32e1b5fdb7

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