Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8351845ef53df7…

MALICIOUS

PDF

82.4 KB Created: 2021-03-27 17:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 057cac68621f101dc534c5d4497447d9 SHA-1: e490b43209d5f7b7a9a493a7a5418bc372108b07 SHA-256: ba8351845ef53df71d702c7a869828a01d358fd2cdba8b2ca6cee5c8922eb816
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to direct users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/award?keyword=advanced+nutrients+feeding+chart+pdf PDF link annotation
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/7269829.pdfIn PDF document text
    • https://lisozuko.weebly.com/uploads/1/3/4/7/134723473/xakalazo.pdfIn PDF document text
    • http://natasisenexu.22web.org/vapurewebuzusetijexob.pdfIn PDF document text
    • https://nubenitenaw.weebly.com/uploads/1/3/4/0/134016689/tubidewumelafar.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/nadugabifikap_faderi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_495cc8a45b0c40d9b6f1c8f2e04b42ab.pdf?index=trueIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_85399b541ad145b2b5a884e5554032c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4cd6f9-1a36-4d92-a80c-8a52f1712c57/5518326789.pdfIn PDF document text
    • http://rufupiz.rf.gd/64156404320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4063ba-22cd-4bf9-bd46-14f9baa218b4/how_to_repair_timer_of_washing_machine.pdfIn PDF document text
    • https://823acdd9-a577-44cf-be53-edc9b656d4fd.filesusr.com/ugd/c4ccc4_3bd68458a47b45f9b5805924d67d8cfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/facf3d3c-71b6-4117-b4cb-44b9f3c9d167/42191974947.pdfIn PDF document text
    • http://nuwiron.rf.gd/terbutaline_sulfate_davis.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_46c908eb37e440508cf7cfca14cf4aa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a9af0a-d111-4e3d-95c8-bf6bf70fedb8/93954066532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b723970c-f3de-4521-be99-49f08e3c496c/tegomuvawerubaxakin.pdfIn PDF document text
    • http://nivigiwaragere.epizy.com/destiny_2_guided_games_2019.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_869d5434ec3e46c5a31afcb22e937927.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a2692a-3c1b-4f9e-b75e-394867995c36/2019_accord_hybrid_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9352ec63-a5f9-4e5d-a3c5-529ab7d7d1ff/php_html_code_in_json.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd493b5-a363-4f2b-b835-844927850731/panasonic_tc-p50st50_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5aaf538-0eca-4a9e-b1c7-e9f45034e0b4/54167522483.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 5208 bytes
SHA-256: f49ea98aadc31563e2f89860bd27e2719d05a90db4546dd72ac8dc4385d521c9
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10772 bytes
SHA-256: c5ab997a9c3cc6530446040f2d67f509fd358c33321cd42b422af818117e5924
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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