Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc776b1178e69aeb…

MALICIOUS

PDF

76.3 KB Created: 2021-01-14 05:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a0723fade8334278d7ccf077f83985ba SHA-1: 2251718e30aff7bc785814bf3db71fd613d1474f SHA-256: cc776b1178e69aebedb0172cc14954ab471f4eaccaeffbf868008b39e36ac1a1
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including a critical redirector link to 'https://gettraff.ru/aws?utm_term=hdfs+fsck+report'. The document's structure and link farm nature, combined with ML and ClamAV detections, strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=hdfs+fsck+report In PDF document text
    • https://site-1175941.mozfiles.com/files/1175941/diziwowivixikan.pdfIn PDF document text
    • https://site-1178069.mozfiles.com/files/1178069/rafifavurabat.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/retail_stock_inventory_excel_spreadsheet.pdfIn PDF document text
    • https://site-1173424.mozfiles.com/files/1173424/92421977167.pdfIn PDF document text
    • https://site-1178268.mozfiles.com/files/1178268/63932937641.pdfIn PDF document text
    • https://site-1175442.mozfiles.com/files/1175442/freeway_insurance_good_reviews.pdfIn PDF document text
    • https://site-1173237.mozfiles.com/files/1173237/kunumasujaxijutimimakil.pdfIn PDF document text
    • https://site-1173730.mozfiles.com/files/1173730/best_army_clash_of_clans_th9.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/75277883955.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/pafenejupirafida.pdfIn PDF document text
    • http://<host:port>/logLevel?log=-setlevelIn PDF document text
    • http://<host:port>/logLevel?log=<name&gtIn 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/gogunabones/nesupusovufizusixu.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/movie_store_app.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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 4564 bytes
SHA-256: f15b3660bb12cff5090a42ac54a181cd6ed862648944e697dbdf09bc08607826
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 13040 bytes
SHA-256: 5ada842de48c65cdb27cf620e19447faa2bd537f922ad3d6c99f6a4173f2d0c2
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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