Malicious PDF — malware analysis report

Static analysis result for SHA-256 3941f121fd824453…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 20:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf086dff00bea852a95bf916ae5ddf6b SHA-1: e5684e4a2bd5f5d3a9dd7d32b31038bf8b5a9d5c SHA-256: 3941f121fd82445386ba55baee3d620a8e148115af63f09a56d536247cf43c51
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV, and exhibits characteristics of an advance-fee scam. It contains embedded JavaScript, which is likely used to download and execute a second-stage payload from one of the numerous external URLs. The document body itself is heavily obfuscated and unreadable, but the heuristics strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • 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://ndmoyun.com/calisma2/files/uploads/11078464903.pdf
    • http://scarpatti.com/files/gagufu.pdf
    • https://camphacement.vn/upload/files/bamanub.pdf
    • https://beldaoyun.com/calisma2/files/uploads/73659222031.pdf
    • http://biblioteka-belzec.pl/upload/files/fuvapan.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/45124203480.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/nonagogubutizetise.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/ziroxoliwekononiwiroz.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613333569b2a3---30164673039.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/78003420907.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161323237ae3d6---sakosiberogazaxesejefoke.pdf
    • http://adamlegal.com/userfiles/file/potozabudinevopumopetu.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8be392810995d3fd085e75fded7d7c0d/dagabimomox.pdf
    • http://eamenfaraz.com/cache/fck_files/file/74031861812.pdf
    • https://kolegium.inaheart.org/upload/files/69441361567.pdf
    • https://projekt-lesen.de/userfiles/file/guketinodibabaxeritutu.pdf
    • http://thietbimaugiao.vn/Images_upload/files/38162143050.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/zemurebopibulitot.pdf
    • http://lpsa.cz/userfiles/file/lejeb.pdf
    • https://luxm.pl/userfiles/file/68067109793.pdf
    • https://thefertilizerproductionline.com/d/files/buwazomakif.pdf
    • https://cantarefides.ro/admin/userfiles/file/wovukam.pdf
    • http://b40555.handyfriendship.com/upload/files/wofamez.pdf
    • https://thefencedocumentary.ca/adminfiles/file/vitonenemufipipexodapos.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/wakologupokabebek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+connect+to+internet+with+android+phone
    • 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_off0000eacc.bin
4ae186e85cc1b047af5511d0248ad5ec979f5d7298709c767859d3e63ebe98f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 17620 bytes
font_01_sfnt_off000118de.bin
25dc816a2af39770ff713968ca2d55e67af56d491e805f0f400a7d6a7caf42c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 10472 bytes
font_02_sfnt_off00013093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes