Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4905a8e684ddc0f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 03:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5366d22c3464d40925e01dafd49f1c8 SHA-1: e131ac23f1d72bdd139d9e3c3b41960e76e7bb85 SHA-256: c4905a8e684ddc0ff4d64beca4684744ce87e7c03372f730fa449e8040a59c74
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external URIs, including one pointing to 'nipisod.ru', which is likely a malicious redirection service. The document body, though heavily obfuscated, appears to be a lure related to technical instructions, further supporting a phishing or scam objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=how+to+take+the+back+off+a+kenmore+90+series+dryer
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fe372fd939f5.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_6033537c21a80.pdf
    • http://pejalajumore.22web.org/wuvalepabimosugil.pdf
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5fffe7fd7b9ca.pdf
    • http://jitiben.iblogger.org/tawogokak.pdf
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5feba69def805.pdf
    • http://salukapebuke.iblogger.org/74452860470.pdf
    • http://pamuxixa.iblogger.org/perotur.pdf
    • http://rutakaganutidu.22web.org/aldous_huxley_biography.pdf
    • https://static.s123-cdn-static.com/uploads/4409244/normal_5fe548b490564.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_6033b1c9b4752.pdf
    • http://nuwiratuzitezep.22web.org/39408811944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bimibukiju.rf.gd/29925178368.pdf
    • http://dovitunazimaze.epizy.com/fomawexazipagodajakemad.pdf
    • http://lufafutogixafu.rf.gd/guralewizupenesotojov.pdf
    • https://s3.amazonaws.com/jobavo/1996_jeep_cherokee_fuel_pump_fuse_location.pdf
    • http://bifurul.rf.gd/kabuwinovimexenavenuroj.pdf
    • http://beruwawi.rf.gd/how_to_use_orbit_sprinkler_timer_manual.pdf
    • http://sobegomogi.rf.gd/scala2_water_booster_pump_manual.pdf
    • https://s3.amazonaws.com/muxozuvalubi/98367387510.pdf
    • http://demajipo.rf.gd/biography_essay_format.pdf
    • http://medazigudid.epizy.com/cursive_writing_a_to_z_capital_and_small_letters.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e772.bin
27942ce87730f0f303c2a1740a8297ee611c42e7be4e70a88b405ea65989e8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5888 bytes
font_01_sfnt_off0000fb65.bin
b49c8e5e5ea4c7adc8770672784f404624fc6f1975050c2ca9f8ee6f271d790c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10408 bytes

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