Malicious PDF — malware analysis report

Static analysis result for SHA-256 e791a1eb9cc3ee49…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 13:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25302bf112ed28ad9951fb9033a181d8 SHA-1: 78bbfc635434a33b77bc515d162d8b24f89279fa SHA-256: e791a1eb9cc3ee495f10a8d4c3ff17093f11dfacef4b4457947b60400fdd5a8d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to 'maypoin.ru', suggesting a link farm or phishing lure. The document's structure and embedded links are consistent with attempts to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=libro+calidad+total+y+productividad+pdf
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5fe52f92567cd.pdf
    • https://cdn-cms.f-static.net/uploads/4366305/normal_601120640f660.pdf
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff4a6a931e0b.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6027e1b97e399.pdf
    • https://cdn-cms.f-static.net/uploads/4467036/normal_602c50f1890fb.pdf
    • https://cdn-cms.f-static.net/uploads/4384030/normal_603deffee1970.pdf
    • http://gibelepij.scienceontheweb.net/26759910166.pdf
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fe2cbb7291c1.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_600f9d36b8783.pdf
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/116452.pdf
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/a4b142db4.pdf
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fdce94b8a8a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bumejefivoxigo.myartsonline.com/schizoaffective_disorder_dsm_5.pdf
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_58b1e0f016b042c99ddb85f4adbdcac4.pdf?index=true
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_4e9fbbaa4b1546b4b81ebda08f99bbc0.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_6ed43008fa9d437e85dee5b1c339ecb9.pdf?index=true
    • http://karokifewugasuz.onlinewebshop.net/html_entity_list.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_off0000edc6.bin
b088d8f0cb701de1aad1f9521c392200431e3fe1a4eee6e2496e24f11ff842d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 4872 bytes
font_01_sfnt_off0000fe67.bin
7b04b516a3ef589f5400f7322c449c123097cf2dae4593897626606c4f93606d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11132 bytes
font_02_sfnt_off000122eb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 4324 bytes

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