Malicious PDF — malware analysis report

Static analysis result for SHA-256 5190996a10633e00…

MALICIOUS

PDF

82.1 KB Created: 2021-06-04 08:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6966be07c39afb6c09b2471e9d8e3e SHA-1: b7dc89d6683fd8b94c5bd1ddcc219913b13c1cea SHA-256: 5190996a10633e0035d77c054a89d24d00204bfbf26f31281d901def60ffad8e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://catamma.ru/pbw, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/pbw?utm_term=how+to+clean+pure+enrichment+air+purifier+filter
    • https://zunelejodimoje.weebly.com/uploads/1/3/4/5/134526095/sojeguwupexijuzisi.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_60604bbd32542.pdf
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/wosaruvinufefasi.pdf
    • https://cdn-cms.f-static.net/uploads/4493888/normal_6049d21988a03.pdf
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/5281742.pdf
    • https://static.s123-cdn-static.com/uploads/4470029/normal_6000adab81ecb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88609a27-2cef-4ace-bfbd-43b921db87a6/73434164200.pdf
    • https://uploads.strikinglycdn.com/files/3ff6c6c0-f49a-42c0-826f-bf1a4f75f768/alfreds_basic_piano_library_lesson_book_level_2_free.pdf
    • http://siruzosu.pbworks.com/w/file/fetch/144446334/the_devil_is_a_part_timer_manga_volume_21.pdf
    • https://uploads.strikinglycdn.com/files/ad48db0f-f5e7-40fc-b0d5-3048a0ee3c18/powerflex_525_setup_video.pdf
    • https://uploads.strikinglycdn.com/files/526fbc2e-afed-4de4-aae5-ccfd8b5e9ba5/versalift_bucket_truck_cylinder_removal.pdf
    • https://uploads.strikinglycdn.com/files/37280c24-1061-420d-98e8-1f209628975d/42271907490.pdf
    • http://sipibujewadu.pbworks.com/f/rangers_of_shadow_deep_vf.pdf
    • https://uploads.strikinglycdn.com/files/a3587d56-ae3e-41b8-a153-5c93d3c641d4/maluxejogekixezujuwu.pdf
    • https://uploads.strikinglycdn.com/files/af925a24-1d02-4b8e-bab6-26fed9c9a4e1/jesuit_oath.pdf
    • https://uploads.strikinglycdn.com/files/5ecc0a8c-bcb8-4a4b-8a3d-428489bd1532/troy_bilt_honda_lawn_mower_oil_capacity.pdf
    • http://ziriwuru.pbworks.com/w/file/fetch/144599460/clash_of_clans_cheats_unlimited_gems_elixir_and_coins.pdf
    • https://uploads.strikinglycdn.com/files/692f293a-da37-4b8a-a0e4-44ac0746f6ed/56081710834.pdf
    • https://uploads.strikinglycdn.com/files/64cf0786-e4fc-4e89-af9a-9870522d565b/84864125372.pdf
    • http://bovojigu.pbworks.com/f/79832252368.pdf
    • http://genarozep.pbworks.com/f/minor_swing_django_reinhardt_tab.pdf
    • https://uploads.strikinglycdn.com/files/797f8cf8-eae4-4a09-8367-23351b0e397a/gudowolijuwi.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_off00010199.bin
fc6543256757390cc2c393f2916538b4495e65a0191f36356068067cdec95a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 5128 bytes
font_01_sfnt_off000112f8.bin
b32425165c48269e1985cd88f39d41598a5712697de49a06b9de5ec91d7bac28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 11152 bytes

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