Malicious PDF — malware analysis report

Static analysis result for SHA-256 3780162d9b5bb8d7…

MALICIOUS

PDF

84.2 KB Created: 2021-04-30 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b1cf3747c08c4aecb724043f31eebd SHA-1: 59b65c20e65f63e5589b50bcefe4fded73a9c16b SHA-256: 3780162d9b5bb8d738e41f6454226160629b73df479d293de79903a06d1ef4a7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content or traffic. The embedded document body text is heavily obfuscated and appears to be a lure related to 'systems engineering project management'.

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://seumenha.ru/strik?utm_term=systems+engineering+project+management+definition
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6010ef897e6f3.pdf
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6031959fb4464.pdf
    • https://cdn.sqhk.co/bofepefurep/hfHPJjb/cardiac_ppt_free_templates.pdf
    • https://cdn-cms.f-static.net/uploads/4387825/normal_606951321f203.pdf
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/fekuwiv_lapabikidusar.pdf
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fe611ef91daf.pdf
    • http://xenejesujotolud.mypressonline.com/futumunomagojo.pdf
    • http://zexitekaxob.mypressonline.com/56187162717.pdf
    • https://cdn.sqhk.co/labifikup/1Qgigcd/old_fashioned_girl_names_that_start_with_m.pdf
    • https://cdn.sqhk.co/zalivelo/juHT8ih/rubber_snake_on_a_string.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_60219e41dbc7f.pdf
    • https://didoruzokikad.weebly.com/uploads/1/3/0/7/130739542/967788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://400b80c6-1433-4f09-98d7-663047953c42.filesusr.com/ugd/bca722_80520bdae48c486bb197a48c735a5e28.pdf?index=true
    • http://sipanokule.onlinewebshop.net/87848714934.pdf
    • http://jonesojawu.myartsonline.com/nabal.pdf
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_d4c75a94bb4b435da2d6a3521eb023f4.pdf?index=true
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_6ce1e591333d4149bcba7d6c1d499575.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_off0000faf0.bin
63f74acb398012f37956f4f2601b29fa43fad1f0f9d80bbd8b53ab1278fbcb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 4912 bytes
font_01_sfnt_off00010c2b.bin
fc12038205b3720277b16b3a099d3c46961226a5152fe077f73c316c7becc7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 5724 bytes
font_02_sfnt_off00011fa8.bin
f0d230c5ed94511a19d93a96b779d88379ce09b5c86895a2c3a9806763fbc87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 10340 bytes

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