Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b67b62795fc82f1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 23:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2297f3e9a46e19837b68673acc4c7b5f SHA-1: ccbb27f5d40cbf9219e1507a868eef16940c30a2 SHA-256: 7b67b62795fc82f1aa6d01f255f505f88038a187432a8398fbfef5f072165816
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to suspicious domains and are flagged as part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://allytemp.ru/uplcv?utm_term=what+are+fried+zucchini+flowers+called+in+italian
    • https://ceccardolj.ro/userfiles/file/13779464578.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/jaligisa.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2gfk4749qdapk075u9hhheotl5/juwiruritekevamulono.pdf
    • https://myphambambi.com/webroot/img/files/95335423525.pdf
    • https://ms2gacor.com/contents/files/mevelatatadanisi.pdf
    • https://neksav.com/upload/ckfinder/files/21982815308.pdf
    • http://tsrmmessina.it/userfiles/files/jeromem.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/dirozitibokivakiveniporas.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/61946500506.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/42041464523.pdf
    • http://owv-sad.de/userfiles/files/rinirumewadejowupeg.pdf
    • http://chiangmai-esc.net/user_img/files/dijixatu.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/wizawobesuzoritotavajox.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/zomawonesetovuwir.pdf
    • http://generale-bureautique.fr/gdb/files/file/sixulanotenawevem.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/luvuwi.pdf
    • https://nutrishop.in/ci/userfiles/files/pobenuxedidifanipajiburo.pdf
    • http://rotang.net/userfiles/file/82443169891.pdf
    • https://echipamente-scule.ro/userfiles/file/nomibonajomusijar.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/kavofojazidivisulosik.pdf
    • https://weldingportal.it/userfiles/file/63636121644.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/13050545796.pdf
    • http://szamosiszerviz.hu/feltoltott/files/bikuxilipadixixebuvepiwa.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://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_off0000e816.bin
5116af1cc16898e0e8874aa54cfab65a33ac0469fa62eb62c08978861a842a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10812 bytes
font_01_sfnt_off00010112.bin
c7e94c29bd13744691f1af639d647c04db422bc7c53b5eb414698374ca288839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 19212 bytes
font_02_sfnt_off000132bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 16792 bytes

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