Malicious PDF — malware analysis report

Static analysis result for SHA-256 caade2ea03acb756…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 17:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e0b6805fd55cd21ecc2ddd21e833f775 SHA-1: 3cfa8998f760d35ccd44e0312d1752afe778e591 SHA-256: caade2ea03acb75605cf74b567f73004ca2709b7b8bb5a6bcea06d2409464cba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=nature+photo+background+images PDF link annotation
    • http://safagiko.iblogger.org/88560976106.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/bhghfha/humraaz_songs_webmusic.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/ieCifkm/derekevowosef.pdfIn PDF document text
    • http://vereffka.xyz/wipemagulitaxalemepamv6711.pdfIn PDF document text
    • http://sk-anker.ru/lawn_boy_recoil_starter_repairkoyai.pdfIn PDF document text
    • http://segwaywheelchair.ru/euskera_ahalera_ariketak2yvw8.pdfIn PDF document text
    • http://mebel-albero.ru/43593376134wdx42.pdfIn PDF document text
    • https://cdn.sqhk.co/libigekukaru/fjfhdly/xojasopibeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_809773afd0234290ad80e7ac1335e14c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c6df8c-2ec7-42b9-b763-f9fa72844411/garmin_forerunner_620_review.pdfIn PDF document text
    • http://sejonigimanam.epizy.com/metulimomedujoteferuje.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_095f75bdb0ab4232bb608fe3a499f4fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a461505d-59d8-40e2-ad37-c5a208f0d08e/20287106861.pdfIn PDF document text
    • http://junikul.epizy.com/lukiwaxikivuwofogixil.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_4c57aa6fb47a4f448b531105db7c3f93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dcfdd3e-6886-45e2-a771-9b51bcb07ad3/kofelenikanemu.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/american_history_reading_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1518cda8-35db-4465-9d74-89ed687331a7/do_you_capitalize_their_in_a_title.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_2eab34d7f6ba4d1898d05bcee2573b11.pdf?index=trueIn PDF document text
    • http://xezexuro.epizy.com/google_translate_arabic_to_english_file.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_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 5628 bytes
SHA-256: db24ebfa7b9835eb7dcc13ab6a352dd62470106f7063d905a0b64bd0a16a99d6
font_01_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 11024 bytes
SHA-256: 1c46b03ee236d35eb4af86a9b0c9dc5d312bac7e083b462afcd385fed174ee98

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