Malicious PDF — malware analysis report

Static analysis result for SHA-256 13792f90a24a3d73…

MALICIOUS

PDF

75.0 KB Created: 2021-03-17 21:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a562a7782658829a13c0c0fa8d54a6b SHA-1: bc1447ec66742ea12b0b5d41573e4f0ab2500d06 SHA-256: 13792f90a24a3d73804beafc1d30dcdaa52052b7f1fd64e046c801a6425b05b2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. The document contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting, indicating a likely phishing or redirection scheme. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest it may exploit PDF vulnerabilities or attempt to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=biographical+information+dictionary
    • http://mydenverneighborhoods.com/62815047743ghru.pdf
    • https://cdn.sqhk.co/jexozumumanu/5chbRm9/wapking_music_2018.pdf
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/xobafewud_gaxenate.pdf
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/4a2f83afbe749.pdf
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/zurebogarur.pdf
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/f12ef0.pdf
    • https://cdn-cms.f-static.net/uploads/4475730/normal_600fc2a71eb71.pdf
    • https://cdn.sqhk.co/midipijikami/wGjaO5Q/14312466436.pdf
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/f4937290e24a84a.pdf
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/pivemobax-gokajedava-gesoxime-pamep.pdf
    • https://cdn.sqhk.co/pujixefan/oBPkhLZ/baxusavugaruj.pdf
    • http://lbaranaydin.com/remington_700_adl_boyds_stockz875p.pdf
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/pagiwixulela.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5fca0ce2f0dec.pdf
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/7979298.pdf
    • https://cdn.sqhk.co/wuzosiboweja/jbtigjh/gardenscapes_online_unblocked.pdf
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/2652670.pdf
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/4a7f280.pdf
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/nosexe.pdf
    • http://seamanygau.best/kixosuwawevakofaxedilerid0ox4z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e973.bin
0312fd6daba757d0f142f6ae7359146733fd9a29aa5d8ba6e2f4394373a1e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 5540 bytes
font_01_sfnt_off0000fc2d.bin
016fd7c1e056dc63ff6bf6828aaf153c8bc044df53fd84a949b10445d5db6555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 10184 bytes

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