Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b971ad21c516313…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 12:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 690b5d517a886966d8f33fcde4b7a5c2 SHA-1: 98d8755e6cceb0bed4d14459d935f6b9625d0bad SHA-256: 2b971ad21c516313a0e280db3e7a3f2b0d00e2e8c682f8661e7b0798f0df7543
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'bologen.ru', suggesting a phishing or malicious content lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are to benign PDFs, but the primary URL is suspicious. ClamAV detection and ML classification strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://bologen.ru/award?keyword=biolyte+2020+electrolyte+analyzer+pdf PDF link annotation
    • https://cdn.sqhk.co/sosobita/YggfjjL/72680168810.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/ha4w8TQ/nasa_bbc_news_live_today.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/dhatYkv/45942612194.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ggjejdH/7759403978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/adobe_premiere_pro_cc_price_lifetime.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/fenob.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/alpine_mrv-f300_4-channel_car_amplifier_50_watts_rms_x_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02ce46d-fb42-4c20-b21e-7be7017b7945/manhattan_gmat_quant_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4e610e-00dc-4a53-b0ad-d2698a33af2b/89398794109.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/manusia_merupakan_makhluk_sosial.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/dj_hans_remix_bhangra_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81521d1-33e9-4a8f-bf6b-b3ce8544df63/24457157647.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/assassins_creed_hidden_blade_diy.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_7c8e2a40f7ef4a54864e068ec45d66fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/23334323677.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_7ba956d84bf84ead9be7a44d863447ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/turbochef_eco_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/reported_speech_interrogative_sentences_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/12292221638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5ea3d8-647a-48b4-a78d-a1ad722202e5/learn_to_read_egyptian_hieroglyphs_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233a8248-c019-47bf-b266-e6383f810be8/when_you_pray_for_rain_deal_with_the_mud_too_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 5444 bytes
SHA-256: 90b72089f27d40fc044770ad746eddfc1689a454b6428070ea56f67815610597
font_01_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 11504 bytes
SHA-256: 83b9654c14c02bb1bc5796bfdcc11318001b77c79d357595ca0c8d5060b8c72b
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16260 bytes
SHA-256: d25a34a56be33791b66bd7dbe91ee772b39b89bee75ba0e64ef3ea6cb2c10b57