Malicious PDF — malware analysis report

Static analysis result for SHA-256 49830fed57202e6b…

MALICIOUS

PDF

87.7 KB Created: 2021-03-24 09:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a7fe002a9ccbc8a538594be12115b66 SHA-1: 6a4c93ff7525e5a1200fb85b89e2fd1b417cebd9 SHA-256: 49830fed57202e6b292f8231e8545a6bbb5b0dd5e367b63d7d5a1ac5b06fd692
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one prominent URL being https://maypoin.ru/wix?keyword=abate+of+michigan+region+14. This heuristic, combined with ClamAV and ML classifier detections, strongly suggests a phishing or SEO manipulation attack. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://maypoin.ru/wix?keyword=abate+of+michigan+region+14
    • https://cdn-cms.f-static.net/uploads/4458428/normal_601e54c05f6a7.pdf
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/sirel_zonakirudezap_fowuwix_magebixavofafem.pdf
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/fb3ac89f42545.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fe1a3154a284.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601de30d03581.pdf
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/gopumexi.pdf
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fc978c99c07c.pdf
    • https://xobowosesij.weebly.com/uploads/1/3/4/6/134616182/e6a61113b.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6050ef5480823.pdf
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/ef8bc0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4db53182-a21b-40c8-894a-af3c5f039329/temanawup.pdf
    • https://uploads.strikinglycdn.com/files/62ff4647-9459-45db-a409-0d0fec9448ae/what_is_auld_lang_syne_in_english.pdf
    • https://uploads.strikinglycdn.com/files/dc045124-35f6-4935-ab00-68d73c886891/kimetewikevevudaxesos.pdf
    • https://uploads.strikinglycdn.com/files/e63ef418-45d6-4684-b04f-bcd5293511f3/usm4_no_easy_day_rifle.pdf
    • https://uploads.strikinglycdn.com/files/f4e8e32a-7327-4c87-8831-2da22934904d/lg_lp0815wnr_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/3d748acd-0ae6-4036-9eba-595695e4342b/49944826361.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d18.bin
a8cdfa0fe049fc1f840633453c0415a31731b7388992821afc45bffc6e3199a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 5144 bytes
font_01_sfnt_off00011e78.bin
75a6e6060eb4212936073db3eae4faf7c84543c097b4ba2aa9a98c4f776f9e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 11092 bytes
font_02_sfnt_off00014434.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14434 4324 bytes

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