Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cba61c7f13a5e6…

MALICIOUS

PDF

76.1 KB Created: 2021-01-22 08:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: de4759440da0c47f767f6ed1b82ac578 SHA-1: e8820eb4b9a207b1e484bcee665cb5f75022605e SHA-256: 16cba61c7f13a5e6d787d7384f26fc785c65911a120011fbadb001985e45013b
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting or redirectors, suggesting a link farm designed to distribute malicious content or phish users. The presence of a link to a known malicious redirector further supports this assessment.

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://traffmen.ru/123?utm_term=do+raccoons+and+possums+get+along In PDF document text
    • https://cdn.sqhk.co/tinolefowi/jdu8rZh/23086346342.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/5af505.pdfIn PDF document text
    • http://loletopuwiv.iblogger.org/julopadaxativesab.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvakumo/wIeiaic/halo_rover_x_hoverboard_review.pdfIn PDF document text
    • http://buliwomof.22web.org/ishikawa_diagram_template_powerpoint.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/biwijev.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/3aa23ce9c85ca7.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/xeniwule_rupapap.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/Cgfgjhb/80066468421.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/ggO6ibf/square_room_painting_ideas_simple.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/5639763.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/YjihfV7/marvel_stadium_afl_general_admission_seating_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madanekobovuge.epizy.com/47107685764.pdfIn PDF document text
    • http://pidukuniwid.epizy.com/tattoo_keloid_former.pdfIn PDF document text
    • http://bobujosu.epizy.com/jomawexuwamawekuwu.pdfIn PDF document text
    • http://luzigipo.epizy.com/bakrid_mp4_video_song.pdfIn PDF document text
    • http://vukenorap.epizy.com/4028175472.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 5392 bytes
SHA-256: 5c6446be13a8579c4b4b40979b343eef8353c2c7e51897d3d812d7e2282e0fe4
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 9716 bytes
SHA-256: 0645dc1d79ec8d1a44b891cbdaafda88722e0c604440235222ccca07607a8a68

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