Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8aa6491d6f4e36…

MALICIOUS

PDF

80.3 KB Created: 2021-03-13 23:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: effd6b8164d0b79551cdf7e42912fd80 SHA-1: 2364765b85aed7233bff0757c52a32c4098bdc7e SHA-256: be8aa6491d6f4e36760e3ba0ce1e78a413422db7aa0aa70635bd203b01b5488f
176 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to lure unsuspecting users. The heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pattern, although the document body itself is heavily obfuscated and does not provide clear instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=national+anthem+of+pakistan+music
    • http://gixitetopes.scienceontheweb.net/appointment_in_samarra_w_somerset_maugham.pdf
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/7a0a59398.pdf
    • http://neridofufuleteg.scienceontheweb.net/diccionario_biblico_completo_gratis.pdf
    • http://fagumawegoleleb.mypressonline.com/onkyo_receiver_protection_mode.pdf
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/9431378.pdf
    • http://toteganutiv.66ghz.com/459421955.pdf
    • https://gimepaponu.weebly.com/uploads/1/3/4/6/134614910/kepobe.pdf
    • https://cdn-cms.f-static.net/uploads/4406481/normal_60468d12c03da.pdf
    • http://vuzetasavuxoso.mygamesonline.org/avaya_one_x_agent.pdf
    • https://baduripafab.weebly.com/uploads/1/3/4/6/134623558/dezader.pdf
    • http://gaximivotekole.mypressonline.com/ao_smith_water_softener_reset_button.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6013e9d319cbb.pdf
    • https://cdn-cms.f-static.net/uploads/4420468/normal_600b635617110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/selivuvumepaveb/ill_be_there_to_save_the_day_superman_lyrics.pdf
    • https://s3.amazonaws.com/muvevanepen/42698235789.pdf
    • https://s3.amazonaws.com/wekibik/angular_5_change_detection_performance.pdf
    • https://s3.amazonaws.com/lanaladu/alcatel_pixi_4_5010x_specs.pdf
    • https://s3.amazonaws.com/zexozavo/insurgency_sandstorm_full_game.pdf
    • http://lusuzajemofim.rf.gd/red_dead_redemption_guide_100.pdf
    • https://s3.amazonaws.com/zupenafud/geleruwibelefokirulabusuz.pdf
    • http://kokibitumoxa.epizy.com/girl_guide_store_canada_discount_code.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_off0000ee21.bin
da0f05dea4e90f1eaa90bf356d9a25d88fc8933b1f9aedfd0c50e73f7391baf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5076 bytes
font_01_sfnt_off0000ff3c.bin
ccc93868b61ca120ca045b443938336e12b9065f09b061a80b2e5c6e2e3ab53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 11480 bytes
font_02_sfnt_off000125df.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 4324 bytes

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