Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc23373eac2b8412…

MALICIOUS

PDF

69.6 KB Created: 2021-06-11 06:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc62440666eb4d2303efbc8e1d6eab5 SHA-1: 7a2e1351fac3433d9a440bd589acc6a92f58bb09 SHA-256: dc23373eac2b84121ca6b98f8f794cb7b9487802b9603b52992886c263485819
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the document's structure, despite the lack of readable text, point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=pal+pal+dil+ke+paas+song+download+arijit+singh
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/dd748388f2bb34.pdf
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/7559562.pdf
    • https://tizirabavapamob.weebly.com/uploads/1/3/1/4/131453045/wejivejizo.pdf
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/bunanu.pdf
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/1658185.pdf
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/libumeva-sixewi-xewexuvo-sowitesiwaxur.pdf
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/watejuji.pdf
    • https://ximuwiwafit.weebly.com/uploads/1/3/4/8/134851464/e129653.pdf
    • https://ligezuwokatajef.weebly.com/uploads/1/3/1/6/131606313/9e17b.pdf
    • https://xaxafojub.weebly.com/uploads/1/3/0/7/130738676/wotuwogib.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/7038031.pdf
    • https://pazibeze.weebly.com/uploads/1/3/1/6/131636707/c41e1b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijomirurefi.pbworks.com/w/file/fetch/144449316/what_is_company_law_definition.pdf
    • https://uploads.strikinglycdn.com/files/8db0d24b-c8c9-40bc-ad10-5ad9bcd4dd4d/fujitsu_halcyon_dc_inverter_reset.pdf
    • https://uploads.strikinglycdn.com/files/fea655b7-0bfa-4be2-9160-417a0a0133a7/why_wont_my_vizio_sound_bar_work.pdf
    • https://uploads.strikinglycdn.com/files/d8e2a6de-382d-4703-937a-b74763e16d40/new_punjabi_song_2020_dj_remix_hard_bass.pdf
    • http://jetubabup.pbworks.com/w/file/fetch/144574581/how_do_i_bypass_ifit_on_treadmill.pdf
    • http://mutoteja.pbworks.com/w/file/fetch/144906225/20894516781.pdf
    • http://gitizuxob.pbworks.com/w/file/fetch/144738087/bleach_brave_souls_mod_apk_2020.pdf
    • http://zezupagijene.pbworks.com/f/share_notes_between_iphone_and_android.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144483516/hazreti_yusuf_full_dizi_izle.pdf
    • http://lururefisu.pbworks.com/w/file/fetch/145061646/15239527849.pdf
    • https://uploads.strikinglycdn.com/files/0fa84e7a-4244-4faf-b477-987781251294/epson_stylus_nx230_not_printing.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_off0000d1a6.bin
cc7f561e9bf1ed9eef8bb2f26785399bcc37c74d7e2eb1765c146ae34abd61b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 5452 bytes
font_01_sfnt_off0000e442.bin
3248c0a8911f853734de364f5abfa96c915c44a620cc1df00e3837f611e16962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 10676 bytes

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