Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ffe1c003a5b28…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 09:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a6d53522e414444c8b19a90da34cda46 SHA-1: caf7a4c5fcae2b17d2b176a780fcfb13477d0d85 SHA-256: d88ffe1c003a5b28c69087fbcce33f1c710514bd6e09bd8c1f1629b0dadb4c62
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'fokemale.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://fokemale.ru/aws?utm_term=how+to+check+anode+rod+in+hot+water+heater PDF link annotation
    • http://jirenaxapibetig.scienceontheweb.net/xazobomubuxamiwuwirigenuw.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/89711675495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_6fadb077cd98482aa349457441a0d3bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/adobe_lightroom_cc_tutorial.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_4e0de1cbf2424770a8105521db280a2c.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_f651ecb5a94b4a8dadf6de73c6984942.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/wenimiwerotujixuzibe.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_96e68f12b2664f6da13cbfadc8d10d87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/introduction_to_mathematical_statistics_5th_edition_solution_manual.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_6626ef35d7fe4eb4a95da66c566273e6.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_f3edb414c4c246b7aa36569ce23bd1eb.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_115de79866d042d0b9d794b60830f1b8.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_6c21713ad0824db3a24149c635653fc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinilederu/mokogolo.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/staples_shredder_lockout_key_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/whatsapp_apk_telecharger_gratuit.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_483dcaf4890a4b60b2020d0c4001bee1.pdf?index=trueIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/29413962623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735777d9-d8ed-4c33-98df-94397db9b724/49714679886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619a7ff2-b7ad-4ec5-a12a-ecb2d6ecaada/juzaxobape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab157d19-4420-4e61-aad0-12f2ecf7fd0c/74456626351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607909e5-360e-4b2e-89b7-4e9f63f7e27c/kuvofajesebur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f4d7e2-790e-44bb-ad51-6152d3ea2f14/jokobuvo.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_09be19dce32c40f0a91f187f65342fb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/kenmore_elite_washer_error_codes_f11.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 4932 bytes
SHA-256: a550e7f76c58059ab504922280ccd2a6185293042cf6993b703909257b8e1476
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 10360 bytes
SHA-256: bfa643642bdd2f942fcf81c0f220ee9c17d21db4c3c83be4ef9034b80e10591d