Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f62baec50d2024…

MALICIOUS

PDF

79.3 KB Created: 2021-05-31 12:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 00a0e7b7ff484f8f59f7acfdfee7b0f5 SHA-1: b150bfdccbee0add9c6d36dfe86b742cb62e06cf SHA-256: 15f62baec50d2024f109c05e7545a7319cb2ad56aa5da126605bcfaaa45269b4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://dafemum.ru/strik?utm_term=how+to+use+handy+stitch+machine', indicates a lure related to a sewing machine, likely intended to drive traffic to malicious or ad-heavy sites. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+to+use+handy+stitch+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6068dd2c6289b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5ff76b1d24a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60282e31b57c8.pdfIn PDF document text
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/5199173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384039/normal_5fe060009dbe8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457298/normal_60b3cfcd4bb1e.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/tixibujedurabig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcf22aa317b8.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/2123404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_60681b1115af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_600cf58aa31dd.pdfIn PDF document text
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/c37bb3fab9d.pdfIn PDF document text
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/8df0789c6908b.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/mesatejulegewudeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/433f9bbb-6bc7-45be-a5c4-02d272a64d1a/the_last_song_miley_cyrus_playing_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc15c1d-2039-43e2-8d52-3c320050ec93/optiplex_gx620_motherboard_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943596fb-5fee-4311-b3a5-372950e7c501/vocabulario_en_ingles_con_su_pronunciacion_y_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34c77ab-18b9-41f8-8cee-38a73d6bc34c/sex_offenders_houston_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e683af5d-e721-4db3-bafd-f8319708fb27/singer_3223g_simple_petrol_sewing_machine_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edd44e5-fad9-4bcc-9fe0-abf5daa4db04/garmin_release_dates.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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 5208 bytes
SHA-256: 8d5970a823f02d200948aece0e8b6929882771ffb6634e8aa49a1ea728d70278
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 11172 bytes
SHA-256: d0d9e1185ad7f16d0fe4c01175312a827259f01d4765ecbe1afc1a452aabd334