Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca38678827344866…

MALICIOUS

PDF

86.1 KB Created: 2021-05-25 05:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a4512cdb03eab20fa96ef13ebfe534 SHA-1: c274c04a5b6cad0a4dbd628f4570b79550d0807f SHA-256: ca386788273448668cbfeb7a1f2b062092dc226ec5c9fcef601cae5ab07fdbb0
156 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, indicating a phishing or trojan payload. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The primary URL observed is https://dafemum.ru/strik, which likely serves as a landing page or distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=how+do+i+update+android+auto+in+my+car
    • https://cdn-cms.f-static.net/uploads/4471514/normal_603c6d7bdc8b1.pdf
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/21ad80f071311.pdf
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/segunefumeg_gikujikaramimi.pdf
    • https://cdn-cms.f-static.net/uploads/4489740/normal_603360a9d1ff9.pdf
    • https://static.s123-cdn-static.com/uploads/4493610/normal_600699a335ba4.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6044e081cf057.pdf
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/5f4be3812e.pdf
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6018d79eafbcb.pdf
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/zejobigelafukez-xulopus-vomubodalewukap.pdf
    • https://daluwora.weebly.com/uploads/1/3/4/3/134319963/kepotogilimoxepafuwi.pdf
    • https://cdn-cms.f-static.net/uploads/4412377/normal_604303e72eba6.pdf
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5fd0885598524.pdf
    • https://cdn-cms.f-static.net/uploads/4486060/normal_606e1be349152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8a7b0a7b-2417-4dec-a8dc-63db0a82ca98/do_maytag_dishwashers_have_a_reset_button.pdf
    • https://uploads.strikinglycdn.com/files/61c02633-754d-4e20-8bc6-474d7aaf263a/rotowulosajotemuruzuvupa.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/44573109440.pdf
    • https://uploads.strikinglycdn.com/files/673a4b42-1e9f-42c0-924d-01a83983971b/what_girl_names_mean_blessing.pdf
    • https://uploads.strikinglycdn.com/files/306d20d8-1e62-4dd0-9bb6-187e953e30ec/what_is_the_exact_location_of_tokyo.pdf
    • https://s3.amazonaws.com/kosamupim/anghami_apk_ios.pdf
    • https://uploads.strikinglycdn.com/files/d68992a2-8777-44bb-b1c9-e0006326fcc3/oracle_database_12c_release_2_installation_on_linux.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/cae_exam_sample_papers.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_off000105ac.bin
80dec391c568edb37fe901ce8dacc42928fdb0dd5a58cb0893f2239d0db686f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 5044 bytes
font_01_sfnt_off000116d1.bin
aedf1c183c5190cc6c956fc52b8994943745641e5704a901bc6e19e87979a929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10752 bytes
font_02_sfnt_off00013b63.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 4324 bytes

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