Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a0a82ba4a68839…

MALICIOUS

PDF

79.0 KB Created: 2021-04-21 03:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 220a888eb13e57462ec6f87f2a9a0ba4 SHA-1: 22eb8a13aa466c56005f398bceb217d0d4f2c9d4 SHA-256: f0a0a82ba4a68839f18f5e9462670318a1827e9bdecef13c7ec59cc900fa6a35
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a malicious redirector link. The embedded URL points to dafemum.ru, which is identified as malicious infrastructure. The PDF also contains numerous other links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to lure victims. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=how+to+make+doll+furniture+for+18+inch+dolls In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_600905db241f8.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/how_to_put_jlab_in_pairing_mode.pdfIn PDF document text
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/vobefipekof.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/passport_9500ix_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_601eaf4dcff43.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/vipakadazifep.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/what_should_an_air_fuel_ratio_sensor_read.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe10ed060062.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/de_institutione_musica_boethius.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff170536b693.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fceb55ba803b.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/Jjcziix/18539841725.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/TRtWfji/hurricane_outbreak_apk_mod.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/gagojetos_bobumiwasamora_fedokitasisow_zatorelozinese.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/bovenotojitowe/45451870635.pdfIn PDF document text
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_cd3761d8a7c648be9b742c96c7a81014.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/69073296156.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_9302755fa8c44b42887b9379d40aefe0.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_2f9631311ecc43a59750b818674fb6d4.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_e7e70ac615d742c9accafbc3c0a0e51f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/can_i_reschedule_my_cfa_exam.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_240503f70b7c434dbb121bc4bf5c1550.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
    • 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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5624 bytes
SHA-256: 9eaef06d30e6a99b4eb462c390a04860d25ecbef18bb342a3f31ad283e9deed6
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 11008 bytes
SHA-256: 94b3173170a9dac30c26f7f2b2462200c4b8332274f8b0adaa6be10ab7731097
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf