Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a85f4c442120d7…

MALICIOUS

PDF

70.1 KB Created: 2021-02-23 22:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b4b1b8e102f33e84c7c0016b826e1f6e SHA-1: ab299537e3156e25148d1ffa62d78301b40dd482 SHA-256: 11a85f4c442120d7c85674491a69140b36bece505c30940bf3ebcb03d2629fdb
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/strik?utm_term=how+to+use+hamilton+beach+easy+reach+toaster+oven', suggest a phishing or scam attempt by directing users to potentially harmful websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=how+to+use+hamilton+beach+easy+reach+toaster+oven In PDF document text
    • http://good-production20.site/fringilla_vigo_witcher_3liync.pdfIn PDF document text
    • http://datingdate.site/20638583819o4ckd.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/lukokiwimasogib.pdfIn PDF document text
    • http://verenica.net/form_b_pakistani_passport1yx67.pdfIn PDF document text
    • http://shopmzm.site/9773154147385jrj.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/nulefibuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_6008247c68d6d.pdfIn PDF document text
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/xawelumopimupamazoge.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/8327355.pdfIn PDF document text
    • http://hydra.moscow/grit_blasting_process1qxq2.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/physical_chemistry_mcgraw_hill6heeh.pdfIn PDF document text
    • http://qunit.space/80781573950hjtqb.pdfIn PDF document text
    • http://shop-kid-toys.online/86043348311km1wc.pdfIn PDF document text
    • http://potenciy.xyz/el_milagro_mexicano_mapa_conceptualfie3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/72384190376.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/acne_studios_jeans_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/16108382993.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 5392 bytes
SHA-256: fa410e1abe84f22b7ef46e5c28405ab8d9d5e78a2a1cc9700d423ffa79eacfc5
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 10556 bytes
SHA-256: ae2d1e438fdb64297f6a10b4d42a2793df6b38f25045dd07ef2feb75f0868542