Malicious PDF — malware analysis report

Static analysis result for SHA-256 257f1715d64f4016…

MALICIOUS

PDF

86.6 KB Created: 2021-04-08 19:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212cc7960be37720178d4aafd8caba59 SHA-1: 6785003cfc976265d80f0b97bbba05513261932a SHA-256: 257f1715d64f4016b16ad18fbd29aafc3e4122d9e89f8a8f993bfdf2d7acc960
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or redirection mechanism, and the 'SE_CALLBACK_LURE' heuristic indicates it's designed to trick users into calling a phone number, a common tactic in callback phishing scams. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=do+eneloop+batteries+need+a+special+charger
    • https://cdn.sqhk.co/lenubire/WhhpVDN/baby_yoda_dark_side_meme.pdf
    • https://cdn.sqhk.co/wobuwozavenu/ihVyifj/zujotugiteguzudedijawugun.pdf
    • http://bepumekelu.22web.org/how_much_is_a_tune_up_for_a_lawn_mower.pdf
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/5343571.pdf
    • https://cdn.sqhk.co/godezixibufo/DsejcZa/truth_or_dare_movie_netflix_2.pdf
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/63e864654d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nepogewapiw.epizy.com/latest_current_affairs_in_english_2020.pdf
    • http://budekibume.epizy.com/uppababy_vista_v2_2020_sale.pdf
    • http://burufag.epizy.com/kotamowunirig.pdf
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_eb685514f9ef47b19a59e852024fdb71.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/wovewimupinabewejaz.pdf
    • https://s3.amazonaws.com/nakevoja/gapowasubiz.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_82eef59b34c942078d7c81a0f7d523ac.pdf?index=true
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_08cc25eb8f374acab9036483859316f6.pdf?index=true
    • https://s3.amazonaws.com/fukepez/5764755279.pdf
    • https://s3.amazonaws.com/mudurixo/varicocele_symptoms_merck_manual.pdf
    • http://fedaposadado.rf.gd/arteritis_de_las_celulas_gigantes.pdf
    • https://s3.amazonaws.com/dorulusof/nukuvanisakufesi.pdf
    • https://s3.amazonaws.com/fosagoba/analyzing_uniform_circular_motion_lab_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010851.bin
ab22104daf34429d8f1484215d0d5d7368d6cebe578fdf12afa7a381c2a15659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 5264 bytes
font_01_sfnt_off00011a1e.bin
c656ad2562e3d404209803009158b6a44398b879f2c33d5e1a16e690c46a6861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10824 bytes
font_02_sfnt_off00013efb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFB 4324 bytes

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