Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72d921043f2467…

MALICIOUS

PDF

71.6 KB Created: 2021-03-30 17:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38ca4129e0dbb2f87319d953088b8093 SHA-1: e5ce9010cff03d02b37fd0d97b9c7d784ee7730f SHA-256: de72d921043f246791b393d43b17b8095692b875db615e5cf5b9cb4fb2f6f7d2
244 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL that is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to resetting a remote control. The presence of numerous links, many hosted on disposable domains, indicates a phishing or scamming attempt designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/strik?utm_term=how+to+reset+remote+control+for+lg+tv In PDF document text
    • https://cdn.sqhk.co/tobijoge/niaoiiZ/pencil_sketch_art_for_beginners.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/mepozidelolepax.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/jiAH5Dv/college_hockey_games_on_tv_today.pdfIn PDF document text
    • https://binewetakug.weebly.com/uploads/1/3/5/3/135326509/b95f06394320bdc.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/QgivBid/xetejadupane.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/OLjgiba/38416380048.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/ooigifV/the_tiny_bang_story_light_walkthrough_part_5.pdfIn PDF document text
    • https://taresazafo.weebly.com/uploads/1/3/5/3/135335901/poboguvowifo-xemijuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/ejdz8ib/xanazizagam.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/igcigJ2/planboard_free_lesson_planner_for_teachers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5886e1255db94be4880506b86b90a6fc.pdf?index=trueIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_2363132f844c46f2bbb019d30a52f27b.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_3ed840f7519c4aa885fd8b39a2e5c8dd.pdf?index=trueIn PDF document text
    • http://jamekatenevo.rf.gd/benop.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_28de83a4cd72464db16c3b76aaa7e98d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/namudir.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/first_90_days_plan_example.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_3a03da880cb64d5db5d841fb1c4ea371.pdf?index=trueIn PDF document text
    • http://zamoguwudegovo.rf.gd/aws_certified_solutions_architect_associate_dumps_2020.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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 5104 bytes
SHA-256: 1f60cc18628eab5982af3e926c1fc0b200d0eb9c94c7a7dd11ebbd1cebd7387e
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10324 bytes
SHA-256: 4f349cf62197c257d5969e206c9814b2ca1ebaaec981af8c27f1819095ab8059