Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba55184112d940a…

MALICIOUS

PDF

82.0 KB Created: 2021-05-02 05:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc275b152c6e058411a2584abb523700 SHA-1: e92d6bf306900e2bd7f7dc6fd642d9f141a6df2f SHA-256: dba55184112d940af418891ba77686506ce2f289fd09a565410ec88a70787aa7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body, though heavily obfuscated, contains text related to job searches, likely a lure to encourage link clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=aircraft+maintenance+engineer+jobs+in+usa PDF link annotation
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/d752a84d8.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/foxufexijosise_papagu_napuwi.pdfIn PDF document text
    • http://scrlt.xyz/mubozabijokilukifulajese6ns2y.pdfIn PDF document text
    • http://ceter.xyz/vobenefapidofisudiwatig8z4b.pdfIn PDF document text
    • http://srakan.space/noxarubemoxojepukem523qx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fdc17024bb6b.pdfIn PDF document text
    • https://wudavatu.weebly.com/uploads/1/3/4/4/134457778/sirapuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_604fc3a334643.pdfIn PDF document text
    • http://rameautbxy.space/graphic_design_price_list_templateof37i.pdfIn PDF document text
    • http://aov.one/duties_and_responsibilities_of_waiter_in_restaurantdwn3b.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/5052801.pdfIn PDF document text
    • http://volosaty100.xyz/20088227910tbiv8.pdfIn PDF document text
    • http://muldwych.com/71698642946yfanp.pdfIn PDF document text
    • http://winoraama.fun/tofabesubivosogowovagelmqfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_6055973560bbd.pdfIn PDF document text
    • http://gsmall.space/kepejegazoma6n3lb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_ee4f84e9b6f8460c908eba9f08826f82.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_025b1290658b4cc0816df13ceb1a4639.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_040b887199364da38d2cf0f3446f63ec.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_475fa0579e7f435ba467d410e05797e6.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_f8e8110571754e62bfba56581f4a9a60.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_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 5372 bytes
SHA-256: 3510c1d289d69f178df2a9b8a0fb7d3c3afaaf6f52634df5be6bf6733e61f0e3
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 11112 bytes
SHA-256: 4e5e20dac2d48f4dd1ee7955d61055909f1ce73795821241295e6eb7fb0b6e3a