Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d39ef8f4421a28e…

MALICIOUS

PDF

66.5 KB Created: 2020-11-20 17:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 208952092fe727d9f2fad5e113d1e63b SHA-1: abf7fe944e60dbd845b65a88833e8aab676451cd SHA-256: 4d39ef8f4421a28e8b7c98f1ce892e5b5b70132aa81a9dfdf596bd03ed18de8e
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The embedded links, such as 'https://traffking.ru/123?utm_term=34+heritage+jeans+charisma', are indicative of a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=34+heritage+jeans+charisma In PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/kagupapudotapadivabe.pdfIn PDF document text
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/4610144.pdfIn PDF document text
    • https://vivenovexo.weebly.com/uploads/1/3/4/6/134695888/540cd7c3675.pdfIn PDF document text
    • https://rovoxidavawes.weebly.com/uploads/1/3/4/5/134584131/8d29099a.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/difezaxi-vonupil-barab-fuwogivixobuji.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.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/c9bdbf23-2795-4cdd-918e-918e268c3f8f/new_challenges_fortnite.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/basic_electrical_engineering_book_first_year.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/star_wars_battlefront_ii_2005_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/action_research_proposal_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5efdc6f-e0d0-47f0-bf39-4bde84a45600/93540916888.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/21750038110.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/63448242876.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/app_to_watch_free_movies_on_iphone.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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 5412 bytes
SHA-256: 72215797d0dd33d01a59b878f62ee72e5927d657bf93ac61ea9e7a8243cc2709
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 10944 bytes
SHA-256: 1c9e9b6922bebe09eccc44073f32fac1d5c679c57591a11675a1c136ecc1fdf5

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