Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc8f5b7322e636…

MALICIOUS

PDF

83.5 KB Created: 2021-03-26 08:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 47e02d757ae8a27eabac994f329a4da8 SHA-1: a0d472091538be3a954b02b1d3d184a9da813d77 SHA-256: b4bc8f5b7322e6367b85b5097f2ee6438e978d7279317094cc3d70fa4f2d1397
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Simgirls gold guide' and 'wkhtmltopdf', indicating a potential lure for users seeking specific content, which then redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=simgirls+gold+guide PDF link annotation
    • http://madoxorijegobe.sportsontheweb.net/ipega_controller_android_app.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/low_calorie_sweet_snacks_indian.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_604514feda462.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/pirimejabuliwiwov.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/vertebrate_zoology_notes.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/fijujiturizifibuletodib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_601366a4ac02e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_e21745900dc34cd3acb2297cecf89015.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b556c2e2-ca63-40a5-8d72-2d5ad273d11e/89908469808.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_b0137c1c1a2f438aa235d48bc07c8138.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/51733084179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824e89b5-5707-495d-83b2-ee453fcc8e26/how_much_does_fl_studio_cost_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/xalebasiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/information_asymmetry_internalization_theory.pdfIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_087e7cbdd0824babb43ea7608cffb065.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_4679cd2456ca426fba69bc85bcafaf88.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_7e9c5aca2943487297569a0f274157dd.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 4732 bytes
SHA-256: 945292183280ef9652e1ea1ebfa5fbea5a14ef41c2ed1ec6a4bde2d30c9619a6
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 11772 bytes
SHA-256: dfdc60903ffc5a71f55d177806a1504874ab0ab03fa26ba54abda40837e7bfa9
font_02_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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