Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1c34f69992dc65…

MALICIOUS

PDF

76.0 KB Created: 2021-03-04 11:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2a9dbea914bcc5cbd8dd34e91d739e01 SHA-1: 2dadc9633f71098f70113954933b30c91238567d SHA-256: 7c1c34f69992dc65e3553c11ee845f1f64a7a46c0eb1db18e2f63d067c49b4c2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'worksheet answers', indicating a lure to trick users into visiting these sites.

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://pelibifir.ru/award?keyword=cooking+merit+badge+worksheet+answers+2018 PDF link annotation
    • https://tasimaxexakopox.weebly.com/uploads/1/3/2/6/132681882/1366568.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/gavofa.pdfIn PDF document text
    • http://load-bcp.com/gyee_english_guidez8yqw.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/3452d32801.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/chick_fil_a_side_salad_calories_no_dressing.pdfIn PDF document text
    • http://digtalcaliper09.xyz/whirlpool_wmh53520cs_light_bulbpz1f7.pdfIn PDF document text
    • https://vurikiwuguwek.weebly.com/uploads/1/3/1/4/131408439/1689105.pdfIn PDF document text
    • http://bathforlegs.xyz/wiketawatup8cx0.pdfIn PDF document text
    • http://kijorifoweb.22web.org/57169305174.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/88011834635.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/bixuvebupidikukazudoke.pdfIn PDF document text
    • http://tujezuwixexute.22web.org/what_does_the_patriotic_mean.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/19248816878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijawazuk.rf.gd/ponibe.pdfIn PDF document text
    • http://vozerurivuboki.epizy.com/50761091437.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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 5928 bytes
SHA-256: 619da9c1dead755094757382b85f891bf6c75dd18559d99ea9681eafd42de352
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10568 bytes
SHA-256: 34a726ecca72fd0295f3d9ed3de191e3b2b3f949202385a6018101b69341b391

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