Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d8d90769ccade7…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 04:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44daca216027aa7bb2663cdfb530e16f SHA-1: d864f1cc09aff4b90cac3cf224380ad457f06df7 SHA-256: b0d8d90769ccade783f04470d92e41d7c9e42ac4a4bb428dfacd671bd09a4afa
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'dafemum.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to PDF manipulation, aligning with the embedded URL's theme. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=rearrange+pages+in+pdf+document
    • https://cdn.sqhk.co/mumaxeje/6VwbicS/mx_player_pro_latest_version_uptodown.pdf
    • http://7lessons.space/72621290005b820u.pdf
    • https://cdn.sqhk.co/gafisasiwu/BtggjaZ/1536597392.pdf
    • http://winnerslm.space/laxemodbo3o.pdf
    • http://pixelbarista.com/video_trimmer_app_for_pcmzqn1.pdf
    • http://rolivazugatar.scienceontheweb.net/96564270200.pdf
    • http://nakozek.mypressonline.com/workout_plan_to_lose_weight.pdf
    • https://cdn.sqhk.co/pibilebomek/jfBsaql/6259909071.pdf
    • https://cdn.sqhk.co/kisereta/apjhyig/buffy_the_vampire_slayer_angel_episode_guide.pdf
    • http://kvrovk.xyz/dulomufawaxubibasun81l9r.pdf
    • https://cdn.sqhk.co/mivuxakadu/hhwlchc/fox_wallpaper_for_computer.pdf
    • http://8bitbeardsco.com/sudewinakbjqwe.pdf
    • https://cdn.sqhk.co/zowolanazew/duhimOH/baby_yoda_coloring_page_printable.pdf
    • https://cdn.sqhk.co/lazimafuxuxi/nhbieie/55079326756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fbb23120-982f-4041-9f62-82c0b92a85fc/sotilinedagenisoworoxax.pdf
    • http://japamitafixe.myartsonline.com/why_wont_my_acer_laptop_connect_to_the_internet.pdf
    • https://uploads.strikinglycdn.com/files/896b45d4-781b-45c8-8255-392c3ed7691b/taurus_pt111_g2_review_9mm.pdf
    • https://uploads.strikinglycdn.com/files/c14989ec-d52d-46a6-8100-39fca9c1cb9d/taxedusiwalopegime.pdf
    • https://uploads.strikinglycdn.com/files/79113ed5-0fb9-47c9-b936-415825ca9c80/what_process_produces_the_two_different_types_of_beaks.pdf
    • http://naxesabefadufu.atwebpages.com/90504548150.pdf
    • http://gukutimaguvuzum.onlinewebshop.net/kilijoradoputoferisasazip.pdf
    • https://uploads.strikinglycdn.com/files/ad990151-a654-4c26-8119-36c4c1623069/how_do_you_program_a_uverse_remote.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0be.bin
ef1716a1d66e2f4d68e0a708f8d6c359eac5fa8293368f5bd49ae75074009f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 5448 bytes
font_01_sfnt_off0000f343.bin
4cf8009aadb8b8811cf9be1f7194747597f4cde1530578ac8f3168b39788afaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10016 bytes

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