Malicious PDF — malware analysis report

Static analysis result for SHA-256 de99980fb0fe34f8…

MALICIOUS

PDF

94.7 KB Created: 2021-02-25 03:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ef55d236abb4505ab441c555b71910 SHA-1: 9cb31af30bacac19e3bb65600afc4c31e2522983 SHA-256: de99980fb0fe34f8d1f2c427c49b084d15c1f0980eb721209caa0de1b7b38af6
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. The embedded URLs, such as 'https://yafferge.ru/strik?utm_term=jbl+lsr305+review+reddit', are indicative of a phishing campaign designed to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=jbl+lsr305+review+reddit
    • http://nizavevorupuj.mywebcommunity.org/gusipumefoxopuwinexipizir.pdf
    • http://marketitaly.info/cero_uno_informaticasqps6.pdf
    • https://cdn.sqhk.co/dexujagafir/iQpUpgc/artillery_calculator_foxhole.pdf
    • http://bosemefawixuwov.mypressonline.com/51419871845.pdf
    • http://potenciy.xyz/fovinebojafuxanobujawej79mox.pdf
    • http://zumewidife.mygamesonline.org/foturikogukexomeji.pdf
    • https://cdn.sqhk.co/foropogajag/kjaieaU/diep._io_hacked_private_server.pdf
    • http://spainwow.pro/letorojp4y.pdf
    • http://copyrightsupporteds.com/what_is_christianity_sacred_textuce20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijumomub/mazesu.pdf
    • https://s3.amazonaws.com/sinadi/sezaliki.pdf
    • https://s3.amazonaws.com/lokijuronig/7708990866.pdf
    • http://magegefopo.atwebpages.com/learn_autocad_basics_in_21_days_free_download.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee6.bin
60fa748a632202cce4477f24238a8af4276d022e2f85006027536707093a5a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 5320 bytes
font_01_sfnt_off00013124.bin
dee0344337a2061cfe4f21f358c9e388c12a131fdd21629e8b19c37db8c0be6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 11708 bytes
font_02_sfnt_off00015945.bin
0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15945 16028 bytes

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