Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f8cefd48d56bd…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 19:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b17d2bf04e253de8e15c44a9e8b15a75 SHA-1: 511c062868eb905a83857a6a3337646764ea064b SHA-256: 637f8cefd48d56bd189bfd9d57b8b779d85933960855e4b9ec4eb4eb3191f9b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites, possibly for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=manual+for+kitchenaid+dishwasher+kudm03ftss3
    • http://theandyhong.com/towawolorivalubibosmqqwg.pdf
    • http://helen-art.ru/volume_of_pyramid_worksheetk54jk.pdf
    • https://cdn.sqhk.co/wolanojijen/hp1JFpe/79220420124.pdf
    • http://masowetimori.iblogger.org/79073687964.pdf
    • http://zeropium.com/71842127511yurm2.pdf
    • http://bbcua.site/business_strategic_planning_templateti19o.pdf
    • https://cdn.sqhk.co/dosakupu/gifFwsi/so_here_we_go_meaning_in_urdu.pdf
    • http://wspring.space/tufatasilalf8s55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_ee36dd9cf1b843fe9c74490335635954.pdf?index=true
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_4fd24e2a8e6e4d61bcfd863ef996c7ec.pdf?index=true
    • http://serezisegani.rf.gd/nasadezakututivanukew.pdf
    • https://uploads.strikinglycdn.com/files/14dceabd-6da9-4dbd-a504-91adcf0c8e7b/how_to_install_a_hunter_ceiling_fan_without_remote.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_dcca9559682947009b7d76d834f45bb1.pdf?index=true
    • http://moretavumafoge.epizy.com/63179945736.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_b7fd9f33d2714a208d7b5d4ff7eb5e6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75bcf122-8317-4cf2-983e-a4c488bb74b4/how_to_attach_the_dremel_flex_shaft.pdf
    • https://uploads.strikinglycdn.com/files/a9e75cf5-a68b-4aa2-82ef-e08e617143b4/spark_book_download.pdf
    • https://216384ea-585c-4f79-9340-ea2fabaf9135.filesusr.com/ugd/99b222_c233db248f4c4aa485a32c7d2664816a.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_74621a2444af4990bc02905cbb236b9a.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_fa70d33ef13c4ba391be50d2a0674a74.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c4.bin
26dbd57a63498fb291e084d39289d3ae7f43cb3fc72a2e613b9af172fd25bf71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 5728 bytes
font_01_sfnt_off0001163f.bin
033d647b7b2981d43aa506e08865d6d85346d19ba9e638ed0f664328585fd3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 11456 bytes

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