Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35f5d029e3e3d04…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 08:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72222bb2a2615866db6449b61597d38b SHA-1: ec4328b11f584575f63509d9f54cf37e42dfe710 SHA-256: c35f5d029e3e3d04514f4eb88c1297a398b479dd03fd7c17a743b505c917e7eb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which are disguised as book titles, suggesting a link farm or phishing attempt to direct users to malicious websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=cause+effect+reading+and+vocabulary+development+book+3+pdf
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/dunimikuligejo-geloj.pdf
    • https://jedijevabepepox.weebly.com/uploads/1/3/0/7/130739982/pidewukomav.pdf
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd6392744298.pdf
    • https://cdn.sqhk.co/xopuwomu/eigvAhg/animal_crossing_new_leaf_3ds_game.pdf
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/bubepefufovidox.pdf
    • https://static.s123-cdn-static.com/uploads/4485442/normal_60055ba4d65c2.pdf
    • http://frankiearvelo.com/51476614865b4zjm.pdf
    • http://bathforlegs.xyz/janulugitosoruri3fvaw.pdf
    • http://rafale.store/antenna_channel_guide_los_angeles6c2pj.pdf
    • http://bnl-jobs.com/miga_town_my_vacation_mod_apk0u5vn.pdf
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/9462058.pdf
    • http://parhelifrl.space/2nd_grade_math_solsgu6jg.pdf
    • https://cdn.sqhk.co/nejajevafode/jbhagdq/sago_mini_trains_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_d2daa82c96bb47acb878994d49a5f67f.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_dbb04c5dbedf462f86f7ec271eb45a0e.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_b1c520c9974a40c5a41209e3a390d1ca.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_4665e7f1ac6741449c21ecf944bc5aaf.pdf?index=true
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_9cf7e047569d4354ba59ec6f5ab8d21e.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_7032c87a448c48c3b1807fc5bc5d7923.pdf?index=true
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_548c429b2ed044ccb734e58b68f8d7a4.pdf?index=true
    • 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_off0000f1a8.bin
57c88a02a4030a3c5a21141ed01750a6108457e8b81f1c09abac503c12acd1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5912 bytes
font_01_sfnt_off000105bf.bin
76319c7c9eccd81f6d97739543880a9969c43ef0eba2299ebab9b9015d77327b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10280 bytes

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