Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c40aebcf87cd9e8…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 22:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4a08e18ed338e1ae742ff44104ec52 SHA-1: 31e24e8e6e08e2393bd9ead5150775a488503fb4 SHA-256: 7c40aebcf87cd9e8d2aa190b3997b7105959f586420e34f01745f495624a7ce4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. No scripts were extracted, but the presence of numerous external URLs points to a content-driven lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=linear+motion+in+class+test+review+answers
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/2185517.pdf
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/bebebodudabu_luwinadi_filejej.pdf
    • http://gazajujana.mygamesonline.org/hallmark_movie_unleashing_mr_darcy_cast.pdf
    • http://xizugef.medianewsonline.com/bejufenekalozot.pdf
    • http://wijasagasipode.getenjoyment.net/metavoma.pdf
    • https://wuliwedifa.weebly.com/uploads/1/3/4/7/134753749/94d5fc93460a9b5.pdf
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/29464.pdf
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/7293951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_30785a3f212f4131a1467d4a86995424.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a2aef64-a5d6-49c3-bf66-30bff67c821d/movurupenujaposuwama.pdf
    • http://litorow.myartsonline.com/visual_studio_ultimate_2013_product_key_msdn.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_6398a31258e54c0b8c6d005258f39c23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2687e49-9eb1-4936-8231-2ce5c7bcc859/what_were_the_three_estates_called.pdf
    • https://uploads.strikinglycdn.com/files/8ecc3114-6b44-4599-9dfe-620ab063ad08/dnd_5e_sheep.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_5fb14d7518fc4c3abdcb857d47804c40.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4651ea2-03df-46cf-bdce-ee018e3516ee/line_6_spider_2_120w.pdf
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_4a78915172e84468985889f10faf20ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/06999fae-338a-4330-a105-4c4544983c23/what_age_is_hobbit_good_for.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_853df07ad8fb475d90ccce5712937062.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin
afe528eaef18116d8bbe9c29675543193172d8e2ca198c86f421b75b2797dba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 4828 bytes
font_01_sfnt_off0000fdce.bin
be02c6c57f67a63d8a2ab2f58d0192090579bfe4074b856b38383f493a6f0419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 10368 bytes
font_02_sfnt_off0001212a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 4324 bytes

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