Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f3b56dc8cfd39…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 01:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc8936b48e728a41502b8e24105feeef SHA-1: 78f1df16f5f8db1616e18596539803ca89b00f17 SHA-256: 786f3b56dc8cfd395f595832dd081cdcc241d256e61441562ab449ab3743db88
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a keyword-based search result. This technique is commonly used to direct users to malicious websites for phishing or to host further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/wix?keyword=windows+8.1+build+9600+release+date
    • https://cdn.sqhk.co/teposodigar/g4lja9S/huey_lewis_back_to_the_future_audition.pdf
    • https://cdn.sqhk.co/rotefuver/jjjgYha/79017293183.pdf
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/13392d.pdf
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/rofigitu-venisiji.pdf
    • https://cdn.sqhk.co/rizitewav/himoXaI/xfinity_race_standings_2020.pdf
    • https://cdn.sqhk.co/rifusofuwedi/d7ihepp/zezuromepesefegixopu.pdf
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/soloxoworezo.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/gegopafofesipuxozoko.pdf
    • https://cdn.sqhk.co/lanuniwa/iWKyWmD/interior_design_finishes_schedule_template.pdf
    • https://cdn.sqhk.co/doporaba/zgiOgcU/98282029726.pdf
    • https://cdn.sqhk.co/bapisolel/hslhghi/nebuseki.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/wogenedetatela.pdf
    • https://cdn.sqhk.co/waxobakal/ggyk624/17468123323.pdf
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/dibate.pdf
    • https://pekizexigobuton.weebly.com/uploads/1/3/0/8/130815014/4311409.pdf
    • https://cdn.sqhk.co/lajawawinu/jdjcPgc/negin_mirsalehi_lips_before_after.pdf
    • https://cdn.sqhk.co/rewanizotaj/charibu/wenokuxuvulakixid.pdf
    • https://cdn.sqhk.co/moxibusas/aANhcvj/8023825974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakusineba/kurenurunadakevoselezes.pdf
    • https://s3.amazonaws.com/tobobowu/zobineboribowo.pdf
    • https://s3.amazonaws.com/gelawiweza/11772987771.pdf
    • https://s3.amazonaws.com/sasufufa/bipigagogatexevosuloja.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec94.bin
032e224002c190ea1608abb918e7d0115fdedb9fa5640cf1024209a247f8da29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5792 bytes
font_01_sfnt_off0001006f.bin
0b4efa305006261bb4a5caa435f16d1f9d258252d089ab42910f5f36eb1043a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 10408 bytes

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