Malicious PDF — malware analysis report

Static analysis result for SHA-256 2956e1a8913f9b11…

MALICIOUS

PDF

81.4 KB Created: 2021-03-31 09:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 81a2c2ff1fb75c917053ab423e56cf26 SHA-1: c0329fcdf09926dbfa94787ba5fd1122305196ad SHA-256: 2956e1a8913f9b1104ea86f8cc8b27b4c3974034bbbdabde9768941ebb5c593e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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.
  • 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://xezojetit.ru/123?utm_term=axmann+geoinformation+gmbh PDF link annotation
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/xolemukifivasok_zodaxesum.pdfIn PDF document text
    • http://ighelpcenter.xyz/lukovasolkcja4.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/5158841.pdfIn PDF document text
    • http://koreanluxe.com/genetics_basics_worksheethz3ry.pdfIn PDF document text
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/8930936.pdfIn PDF document text
    • http://reawont.online/103147774565ao2d.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/jadojinu_lalotafizop_xelamidob.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/boss_engira_baskaran_comedy_mp4.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/4331578.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/9029111.pdfIn PDF document text
    • http://lollipopa.online/load_css_stylesheet_with_javascriptire9u.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/birarugedi-kolivudofa.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/vomixinosuji.pdfIn PDF document text
    • https://sotugenedoximo.weebly.com/uploads/1/3/4/0/134040923/depike_fomurumenet_bigapufiruweja.pdfIn PDF document text
    • http://potugonuxafeloz.iblogger.org/digital_circuits_textbook.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/mukomubevi.pdfIn PDF document text
    • http://mini-cam1.club/6856496393315zz0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivibejegidabiw.epizy.com/minimize_size_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/aadat_song_remix_sucha_yaar_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/dedux.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/why_dont_jehovahs_witnesses_believe_in_blood_transfusions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5168 bytes
SHA-256: d046dbeb00258d88505059f58eacd5f519b557cd16954b7e4519e37e510e679f
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 11980 bytes
SHA-256: 031c127adca8dffd9e2af490f0efec25829877db9f891782e37791acfeb3ed60
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 16084 bytes
SHA-256: a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978