Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f92e4da27ace91…

MALICIOUS

PDF

89.5 KB Created: 2021-04-01 22:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5908ffd9c3ee23a22b9f5fbf5da73e76 SHA-1: b0883d53fedffadd17f390b2dbca36683d92373c SHA-256: a2f92e4da27ace910f3801defbf4c21d4ad2248fca1f1005d6d5f2ef76807bb5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://golowaki.ru/strik?utm_term=garmin+montana+600+usb+driver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5ff40d01b9c8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fe116b24f775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fdda074d3075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5fdfa528da4bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487888/normal_5fec131d0cea0.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://s3.amazonaws.com/wiwuxot/58793003581.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/sakilutuk.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_701a4bf9c3824e7787522b0d59a1a621.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezux/11355618827.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_91cc51c854b24f51a8d40c30f29b6680.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ad8450-45e0-4b99-9d75-318519189e2e/why_is_my_first_alert_carbon_monoxide_alarm_beeping.pdfIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_3a92576d1b2d41819ba38e1c33a9ab01.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_7e4f506416a740a18d704cdcb4d228a3.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_32b5a57e238a497893f036b95559c97a.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_6f2c68c251164ae5882c17f32601503c.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_90b0522e07c0405e8f4a2449d904db4a.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_8c91c55240264547bdf033e216266411.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_eea98e53a9fd43c4b1c7fe28acb3b837.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a2a242566f5b4acc9d84451757f5ea54.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_e9394eed25c44dfd82baf4ce5b7dff21.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_efbb7095db39454abac8ee4b1fa21885.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/kawituzujixilixevinure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba03e403-81bb-409b-8533-8ee892d52396/a6400_vs_a6500_camera_decision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad38457c-25f0-4495-8d60-b134f0aa7bdc/xenyx_1202fx_karaoke_setup.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_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 5348 bytes
SHA-256: 649e36073733827651a8907226b86366a2305c4eb7c7c5862da52414926ac4d1
font_01_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 11296 bytes
SHA-256: 453a9e6c2f8ad1bfe77f8f98a4122f9e4796b4b1db2adfccf1eede5cfc11a490
font_02_sfnt_off000148be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378