Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58dbed3a45f402d…

MALICIOUS

PDF

111.2 KB Created: 2021-03-30 19:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00be73de142b548748603c4dd33b7ca4 SHA-1: d0f8e16c728f221caf3cac17afdb48ec29fb18f7 SHA-256: a58dbed3a45f402da7b49104c307a56344fdc05e665986f062f6500720a2b724
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. The document body, though heavily corrupted, contains text related to a game guide, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/123?utm_term=civ+6+gathering+storm+deity+guide PDF link annotation
    • http://kapovulup.mywebcommunity.org/google_maps_florida_city.pdfIn PDF document text
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/9474581.pdfIn PDF document text
    • https://nubokulusavabum.weebly.com/uploads/1/3/4/7/134702007/9106113.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/30b76cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fec4be55271a.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/vudofepabirunenuxizuwe.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/data_acquisition_in_remote_sensing.pdfIn PDF document text
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/belerarof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_605b5173d4404.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/vikazen-wozavilipup-nivefimib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_6004bcde27d5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_f660b9dce2504a2f9d058d64841d8052.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9627c92-ec5d-4a71-a1c7-fc6cdae3fd30/elementary_geometry_for_college_students_7th_edition_solutions.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_90ce4b9f9a5d4db788a002d225f06b8a.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_a8c38ab7234c4d5b884f4b6db48f26de.pdf?index=trueIn PDF document text
    • http://zonurupadul.atwebpages.com/grouper_plusieurs_en_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/how_to_program_directv_remote_to_samsung_tv_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/ofsaa_swimming_2019_psych_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/japabixeli.pdfIn PDF document text
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_53f205b884a445eebed07393812e39de.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_5815f8023ff34cc3b8eb7d6f57faac57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/37168095881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50841f01-28dc-4bfd-8917-c5dc6a7967d0/79493861852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa6a67d-9bbb-4b5a-a340-f0ffe577e7aa/3d_metal_printing_seminar_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bf3d91-51ad-47b1-b990-b0f2308a42d9/what_was_cause_of_spanish_flu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcefe1a9-1093-4d8b-aca8-8018d6fc0579/2000_honda_accord_transmission_replacement_cost.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_off000175f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F9 5428 bytes
SHA-256: 428d1c4d2c14830b4354e5f49ace09bc8fea4671ea5c7b5cd0ba163a0e02a099
font_01_sfnt_off0001884c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1884C 11128 bytes
SHA-256: 065c65ac054fda413bedb388c8e20d65a0da406a95963a4ad36f191e06e378a6