Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7cf3bb3237f16d…

MALICIOUS

PDF

82.4 KB Created: 2021-10-14 13:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1697c9a62d2c7397d1d6f225587538b1 SHA-1: f36d51855f293d2ba7649010c7174556d3b50ec2 SHA-256: 0f7cf3bb3237f16d519e965dab6d1985808d03ef0efce4f888873e9cd01a9a53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or redirection strategy. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=booster+seat+weight+illinois PDF link annotation
    • https://piphoto.tw/uploads/files/202109160827275868.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/vixemukukolefin.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/1646313229.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/kujupekimazomim.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/99253246017.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/202027744.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/pulutumodizufojo.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/pibibepadixev.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/jorinugovepupejev.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeffb84de4---9913634042.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kepefiva.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rejila.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d63986a2d---fekafogoxiwun.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/pefulavozititilenekune.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/1999068854.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vukimumatalawotisevux.pdfIn PDF document text
    • https://noddy.nu/images/file/jagemuxob.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/32246511114.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/zenusesafovapovura.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/14322604105.pdfIn PDF document text
    • https://mimpidia.com/contents/files/pikavukupokonezupowizowot.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/79227798253.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/49999989520.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/42694047841.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/41171970106.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/44574330409.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://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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10524 bytes
SHA-256: 52c6fe2eff05d599aeaac49e04969f16124fc814fd4b75f228058727f6a5d453
font_02_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 17996 bytes
SHA-256: 861f552bc19aa6e0618ba88b8ad843481ba983328a7cae957ab4cae306b3ede0