Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc408f3ca2003dd…

MALICIOUS

PDF

77.6 KB Created: 2021-03-26 00:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b74d8132fc28cad11262e2a55697168 SHA-1: 5a13e4d026abed7878966fe38ab7ae9bf6f490d8 SHA-256: 7fc408f3ca2003dd0aec4aaf457ae4e03266be9b859a634c76f537963851dbc6
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 likely part of a link farm designed to improve search engine rankings or distribute malicious content. The primary URL, 'https://nipisod.ru/strik?utm_term=navy+seal+training+after+hell+week', suggests a lure to a potentially malicious site. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing or trojan variant.

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/strik?utm_term=navy+seal+training+after+hell+week
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/magutugebagaxub-xubunojodixix-vopomekezu-xinizum.pdf
    • https://felojabok.weebly.com/uploads/1/3/0/7/130739263/jugimowuv.pdf
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/5e6ed7c2.pdf
    • http://dunetetemob.22web.org/widutolokivuguluxamajilil.pdf
    • https://gixixujenusig.weebly.com/uploads/1/3/4/6/134663953/5783699.pdf
    • https://lakubamovoto.weebly.com/uploads/1/3/0/7/130776542/gudadamidutum-subefi-latobifudemi-xogivadubotul.pdf
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/a711a0b8.pdf
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/sabibinizigik.pdf
    • https://wazobusa.weebly.com/uploads/1/3/4/7/134756590/dobejexumegiw.pdf
    • http://zasasalusip.22web.org/71387129350.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/sovax_wibimivuxifemo_fibol_baralaxep.pdf
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/podagejupa.pdf
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/2311028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rexefobixavater.myartsonline.com/exclamatory_sentences_how_what_so_such_exercises.pdf
    • http://beduxidav.epizy.com/56971481148.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_e445b72c978341d0b9543037f9fd2485.pdf?index=true
    • http://pirajog.epizy.com/renaissance_periodization_template.pdf
    • http://kubegixojarabax.epizy.com/xipakowarufigajiru.pdf
    • http://naxesabefadufu.atwebpages.com/bakurikake.pdf
    • http://ropupifalapoges.atwebpages.com/17745651250.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_07323dbd55334ecfb3305e0b24503e81.pdf?index=true
    • 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_off0000f225.bin
86de57cb74865542edb78cca74e0ab2117ca0e127f85b6164867588e6ed57531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5316 bytes
font_01_sfnt_off0001045a.bin
e0e3e500e91fee06b4f1d5c5fcc6de4622d7aba7705f6698f335123d649fe00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10876 bytes

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