Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dcb16257e56584…

MALICIOUS

PDF

74.7 KB Created: 2021-01-22 21:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 71864c6b69ba57f43d6b644b35825773 SHA-1: db958d64cb42c8c5645ca6906fdc9e4921ff8eee SHA-256: f7dcb16257e5658464cad5a32a801c5d51646c52cd50c100c07c5a45867cdb0f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier also strongly indicated maliciousness.

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=downtube+cable+guide In PDF document text
    • https://site-1171887.mozfiles.com/files/1171887/kubenomagefulezerelalox.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/ghhZlhc/football_championship_2020_results.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/nizamurejexenogaxi.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/e2be880d03a73.pdfIn PDF document text
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/dosimawifim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6368935d96.pdfIn PDF document text
    • https://site-1174433.mozfiles.com/files/1174433/ikea_desk_lamp.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/wingstop_coupon_5_off_2020.pdfIn PDF document text
    • https://site-1176860.mozfiles.com/files/1176860/73023328205.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/lasadoperenojosot.pdfIn PDF document text
    • https://pekixutub.weebly.com/uploads/1/3/1/4/131453658/fakufobewoxevul-dizujab-dudelibujifeku-mixut.pdfIn PDF document text
    • http://wumakelanatug.22web.org/54182465225.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/45640607114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5fe5c2955640d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulupalu.epizy.com/79620671873.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/500mb_mkv_bollywood_movies_free.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/11217182252.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 5064 bytes
SHA-256: 4691aac8494b0179e2bc4f2c6d28104bfbeed3339ef290c9ee85a3f74a21d14e
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 11420 bytes
SHA-256: 4e24ba59073127a67cf36b75601d52dcb379564f7d73d3d52c865503745062d3

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