Malicious PDF — malware analysis report

Static analysis result for SHA-256 864d1be6b7399881…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 23:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2029bfc399cce74c1f84381272317d7d SHA-1: 18633cd39e7c1f0f2a6e8c318bdb68c98e7773c2 SHA-256: 864d1be6b7399881a206c6ee2be157f6aee678ae8ae9b16156895eaef16ad8a2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting it functions as a link farm. The primary URL, 'https://bologen.ru/award?keyword=11th+biology+book+pdf+english+medium', indicates a potential lure for users searching for specific documents, which could lead to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8364

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.
  • 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
  • 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://bologen.ru/award?keyword=11th+biology+book+pdf+english+medium PDF link annotation
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/fc4069d943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_603da5430d051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fe8d8ec77f92.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/vupelogigubenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_601330d7c2ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_602d1d05921c4.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/2bffa2d2-1c1f-46ff-9c12-bc43836203ba/all_html_tags_and_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12349ab7-6564-4138-a412-f139bdde48b7/mevaduxopitika.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/fejugifabalizuvi.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_76e6c58fe6f14baca4d28937832a115a.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_cf33712c903e4d76bee359b31b3a4770.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_7df4324d8781407e95edefc9fca6bce1.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_a41149fa54f24bf8b012760ed0db312a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3481cd-6c4b-4f24-bd2b-947eeeff152d/naputewowodito.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_to_use_easy_home_mini_sewing_machine.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_6890f7cdbaff47a8b8a578d429d86f14.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_9aa2a62c5a2f4cc7b25815bb74b8e371.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/96947511487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43ccfa7-9646-4aef-a9c5-fc6d06e01d10/thermos_grill_2_go_accessories.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010126.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10126 8448 bytes
SHA-256: f09f4c8ee3e1b5559f64083b74e6318140fa4749fbc287ac0927288e6672e2c4
font_00_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5412 bytes
SHA-256: 632b73dccb1a0f7604fefbcd661b503b3f9d3faa50c6c71c80455d3a8b33880f

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