Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19491f9e3973ba4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-26 06:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90a33cfbdb1c52c569d285a0b13f8e79 SHA-1: 7443520fd8be312c3380dc520ee86ccf19b8b8ee SHA-256: f19491f9e3973ba46ad72b001bbe4be2f36989371d8c599e33287cd7440a5b9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to seemingly unrelated PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme.

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://nipisod.ru/wix?keyword=carrier+infinity+touch+manual
    • http://golixudib.mypressonline.com/how_long_after_stopping_ambien_will_i_fall_asleep.pdf
    • http://midesamipazizuj.scienceontheweb.net/aviation_mechanic_handbook_the_aviation_standard.pdf
    • http://trysoda.club/27880766650e92v5.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/mororoborolax-fosadepujoso-ziripiki-wasagi.pdf
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/9752028.pdf
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/00f23.pdf
    • http://gipogup.sportsontheweb.net/36298813119.pdf
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/bofupojotopitokuk.pdf
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/gijexu.pdf
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/245460.pdf
    • http://homiak.fun/jugofakijewemov9a8lg.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/murebolufibogirupar.pdf
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/paxigerixod.pdf
    • http://gajaxujifusokul.mygamesonline.org/baba_balak_nath_chalisa.pdf
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/rivutomunofixom_lupefizetatake_peligore_vilopage.pdf
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/2218276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d16c18c-3c6f-41c4-9f62-b10872081946/agudas_llanas_y_esdrujulas_4_primaria.pdf
    • https://uploads.strikinglycdn.com/files/e18fa7b4-949e-449a-b912-c7662fc6e9b1/the_price_of_the_ticket_essay_james_baldwin.pdf
    • http://nopawalaxuwaw.onlinewebshop.net/64004798519.pdf
    • https://uploads.strikinglycdn.com/files/29fb7434-2959-49f4-a641-4791d4e51c74/nissan_sentra_n16_workshop_manual.pdf
    • https://uploads.strikinglycdn.com/files/9adb1e83-1e6a-474c-8a77-e1666606bd45/71673542070.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_off0001030a.bin
2a9245359109f1d4db420989db7e68af4b57313f7924646ee76c205af87800e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 4948 bytes
font_01_sfnt_off000113bf.bin
f630c76f22b553ed9d816d2c5126cc38db2ac7c8070a6e3acf015852a3111f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 11480 bytes

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