Malicious PDF — malware analysis report

Static analysis result for SHA-256 0019996d3a28f1f0…

MALICIOUS

PDF

108.8 KB Created: 2021-04-06 18:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 04197f42afa310d3343da2ad14433680 SHA-1: 1fcdb205a622e5aefe5d4b2688df0689da2a55e4 SHA-256: 0019996d3a28f1f0f8a08fecbd55e24a294230390ee2af9e9cc2daecca699887
184 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. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=alaska+stoker+coal+stove+manual PDF link annotation
    • https://cdn.sqhk.co/donaxewon/rpja9yV/toluzixiwo.pdfIn PDF document text
    • http://pugaxosojusi.22web.org/80297528850.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/8icQpbS/part_time_web_design_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/dqRhfji/gravity_rider_zero_mod_apk_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/uicifP5/titan_quest_anniversary_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/ridetalazo/iD7hagd/12203099983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_17df8cc765534beba16d08d8924d0d11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/latest_biodata_format_for_marriage_in_marathi.pdfIn PDF document text
    • http://fevunurinowigi.epizy.com/wejametogilamure.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_6ff7b88822f74704a7d76aa8ea67d161.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/19287241795.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/brain_on_fire_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/pexenikesodemaxofatud.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/pre_marriage_awareness_questionnaire.pdfIn PDF document text
    • http://godidab.epizy.com/kugotesuf.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/bhai_marathi_movie_hub.pdfIn PDF document text
    • http://sizixezaratog.rf.gd/32706100462.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17339 5060 bytes
SHA-256: 04763f9481b235d1ddaa076a94235adb4fdeeba51052b7d5de8b95cf23bb3905
font_01_sfnt_off0001845c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845C 9792 bytes
SHA-256: 77ca8c0899219753c27eaec432840c9c06071fd02f4cca1ab911ecaf811f1f6b

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