Malicious PDF — malware analysis report

Static analysis result for SHA-256 22db9a67cd1df5a5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 072c8a48d406359ac8e10355304260c8 SHA-1: cda7a1dedecfc91cf55a1d3a7a1e470bed009a48 SHA-256: 22db9a67cd1df5a5011dc719823631b22ac012589713b43e5960132ef3e0bd86
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The heuristics indicate it uses an image-only lure with a clickable action, typical of phishing, and contains numerous external URIs pointing to disposable domains, suggesting a link farm for distributing malicious content. The embedded JavaScript stream likely facilitates the execution of malicious code or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=need+for+speed+heat+apk+obb+download PDF link annotation
    • http://rgn2u.com/userfiles/files/suduvumupobepanemoluxe.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/tawumusekor.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/71840085222.pdfIn PDF document text
    • http://linza-market.ru/upload/files/39866263841.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/35570234407.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/roteputejegelelunixu.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/35360264172.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/52706455692.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/21391937689.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/89426899841.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/46331416728.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/50759602132.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nezopavavukedoral.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/26413637774.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/40764160914.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614483be1544a---57137866175.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/97697844087.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/49804405924.pdfIn PDF document text
    • http://cosyromania.com/media/file/furud.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/42201102714.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jarapolik.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/vutaterumesewuku.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_off0000b058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB058 13768 bytes
SHA-256: 7c2a149e1d478fc2fc2d931dbd2812923abc5f3432e116ac0c413ca911c19015
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 10800 bytes
SHA-256: e0941e668af063096a6e47dc6e2bab131cb67b794480e8c0f7bfce043a7c0692
font_02_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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