Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a105546465cd3d2…

MALICIOUS

PDF

74.4 KB Created: 2021-04-26 20:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a6eb9d70b1a4629c345192f3664232c SHA-1: 3cc2a674f5bdf9061105843ed7af87fabfa1512f SHA-256: 9a105546465cd3d2e633a667d8d9449d2d6b4aae91ad09462e7b9dd5908ae2d9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many on disposable hosting, suggests an attempt to redirect users to malicious sites. The ML classifier output of 0.999106 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=creative+writing+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/mujekesire/7iahfwu/cross_the_bridge_when_we_get_to_it.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/can_you_negotiate_lease_payoff.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/d9jdmpT/slipknot_only_one_mfkr_lyrics.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/virulence_factors_of_streptococcus_pneumoniae.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/bBttIjg/museku.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/iegj9ig/weekend_ushering_jobs_in_lagos_2020.pdfIn PDF document text
    • http://difozoxezepi.getenjoyment.net/momesomevebomasigelexuj.pdfIn PDF document text
    • http://robekilatufage.iblogger.org/7204773984.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/nkjv_macarthur_study_bible.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/cCmxcsh/hay_day_hacks_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0d3141-6dbf-463d-9246-7fd19acc172b/python_for_loop_list.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_8d92b43d05a945eb85795367dfc48213.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ab130d-f220-4eba-b8d2-bd56647a4223/gisenobofig.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/pibuxizekunetadofaf.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_75d0bbde2d92403ab14a6317fd710f00.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_a50ff1a3c37f48a78e2acdd884cc810c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a086a0-110d-4054-88e7-fc314e7f34b5/44007147562.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_9f68e19240654071bbc4735d7dab382b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/597ee386-4aee-47e9-a5e7-9b933f80f7f4/21670011934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f52b389-d488-44ef-8d95-3479ff32310b/91164154557.pdfIn PDF document text
    • http://fuzolegogi.atwebpages.com/18865857039.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_966596433c0544ab97bac2a31ca33ca9.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_e5451534c06c4f91b4be7e4fc95067c3.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_220783022ccb4032bdf8d3ace09ce233.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_b921c0ff4a744f30a7cf531393b1da9e.pdf?index=trueIn 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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5384 bytes
SHA-256: bb29bcfbb576eeb7d7b247f45e5329897520459886be49807dae05d12ab5a9ba
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10712 bytes
SHA-256: 9344c9d6c0a5caa951e3f0d217e5c887f92ae26d064a5d5e5abe7f1bc3f1fe6a