Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9821d1b9f092359…

MALICIOUS

PDF

69.2 KB Created: 2021-05-27 22:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85b0d4dcc6f65d73450ee4a2a3423840 SHA-1: 72bed3181db26946d168e04f390512ba234925a2 SHA-256: d9821d1b9f09235997cead6d2da3ee5cbb520702c49c07f8e5bc82433332b2e1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though truncated and obfuscated, appears to be a lure related to a 'worksheet answer key', which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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/strik?utm_term=worksheet+iv+formula+writing+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fc8521de093b.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/zumowuloluge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_604d2023913ea.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/3214476.pdfIn PDF document text
    • https://togasiwivote.weebly.com/uploads/1/3/4/3/134370981/guzifikovelukiv.pdfIn PDF document text
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/ritem.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/9282068.pdfIn PDF document text
    • https://dojapoxozali.weebly.com/uploads/1/3/0/7/130775013/ditakurozep.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/ruvubumaxok.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/buzarux-rivoji-saturago-bofugolov.pdfIn PDF document text
    • https://felefufo.weebly.com/uploads/1/3/4/7/134768155/sejalazuk-luwanuwujerite-rafib.pdfIn PDF document text
    • https://gilukuxuzi.weebly.com/uploads/1/3/4/4/134494221/rumefunuveg-senalaxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_600c67038d3ef.pdfIn PDF document text
    • https://xikigojajutu.weebly.com/uploads/1/3/4/3/134385057/ferivakorut.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/satofukapev-fenozus.pdfIn PDF document text
    • https://gagafilesiruw.weebly.com/uploads/1/3/4/8/134886729/d7db971f72aa306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_5fd6c9e1a9b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe0d9f3d1f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_605041d99ba2a.pdfIn PDF document text
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/jujokenete_kupuxefovovul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6014bc047c506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ad2de7-b943-4c0d-9cb8-4a6dbb7303df/napokumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830760ff-93d4-426d-8b18-7bf95e92a4d4/62878114628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e040b0-c285-4502-b78a-a2b2c844ceaa/wabimimusurozejog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b63dfa-7754-42bc-936a-70ee82aadad9/49427921062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6587fc-114a-423e-88a2-f53e379a9499/puloguf.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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 5512 bytes
SHA-256: 897d084e46349b1493db611867034131a8f42fd92d3f5d2ce436c829602fd941
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10020 bytes
SHA-256: 4a728378e6aa5daa66f463433f0142d146ee54897d83c2b63f29fe5d6d729152

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