Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9815b1944db8c5…

MALICIOUS

PDF

84.3 KB Created: 2021-03-10 16:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 00d8430fb347884dc9f1e39e13bc7e45 SHA-1: 729857ff6a5c1002700ed755445afbb8efd17467 SHA-256: 9a9815b1944db8c5d27465df2aa1e354a8df821c89fe26115cbfbde100b0f3cb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to "Carnatic music textbook pdf" and contains numerous external URLs, many hosted on disposable domains, consistent with phishing or scam operations. The presence of PDF-specific heuristics like "PDF_SEO_DISPOSABLE_LINK_FARM" and "SE_CALLBACK_LURE" further supports a phishing or callback scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://fokemale.ru/award?keyword=carnatic+music+junior+textbook+pdf PDF link annotation
    • http://bred-enligne.com/zobagusogovodonogujuzegudhg6.pdfIn PDF document text
    • http://pokanupat.iblogger.org/28502325324.pdfIn PDF document text
    • http://superheatbelt.xyz/79870612804m5bv6.pdfIn PDF document text
    • http://fortysgjdk.fun/stihl_fs_56_rc-e_trimmer_review3v9aw.pdfIn PDF document text
    • http://3bki.ru/unstable_angina_guidelines_2017ty11v.pdfIn PDF document text
    • http://mini-cam-v2.club/friends_tv_series_wallpaper_4k41ftg.pdfIn PDF document text
    • http://idealicaufficiale.website/nespresso_inissia_instruction_manual91mia.pdfIn PDF document text
    • http://marketop.club/geropalowisexazipe72cqc.pdfIn PDF document text
    • http://padlamadla.site/book_of_acts_questions_and_answersbf5l9.pdfIn PDF document text
    • http://9gusevshop.space/mukipawufadadafalupomuzvuvr.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/chasing_cars_instrumental.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/fipeduzej.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/thalassemia_major_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/vebuvulavesoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbabc98-c050-4380-b0b3-682b4ffa97e2/vesogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afda671e-b0be-44fc-aea9-23830f4dfdd3/jodadowosiwexunonib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257105e9-da79-44ff-bc76-371217011544/how_to_start_off_a_body_paragraph_examples.pdfIn PDF document text
    • http://jewojaregoluwat.epizy.com/homophones_worksheets_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51030d3c-e5c8-42b3-9c1d-a5ea811ccb8e/torojogojewevezenugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7461dd-6144-4178-a7c9-42f15b0a110d/89268726355.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/blender_3d_printing.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f797.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF797 4976 bytes
SHA-256: ceaae0e4b7ae983b17f99d3817ee669fb2a829a4ccde0b602ccfb6c00d94067a
font_00_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5520 bytes
SHA-256: e76427b50a51ac36306c0ce62b165e118a23df59c4466e121edf4d7855b783ee
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10984 bytes
SHA-256: ad25511f5c5394a5772b312a8c12e70e8ff0761c47e04143d90783e9523b1901
font_03_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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