Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61e614d8d8f6deb…

MALICIOUS

PDF

74.1 KB Created: 2021-04-27 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a69d67da9e5035cfa7966ed3fb6c9214 SHA-1: bb45ae828dd185d054d0b778971ccf5fe6b51732 SHA-256: f61e614d8d8f6deb9d97fd33f03a823c2ce6bf89ffebfd7cf2919321d62e887e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO poisoning tactic. The embedded content, though heavily obfuscated, suggests a lure related to printer ink levels. The presence of multiple external URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or distributing further malware.

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://jumiwimov.ru/strik?utm_term=how+do+you+check+the+ink+levels+on+a+hp+printer PDF link annotation
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/1786862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_60340d1363340.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/birla_mutual_fund_form.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/hospice_vs_palliative_care.pdfIn PDF document text
    • https://jatibamed.weebly.com/uploads/1/3/4/6/134649143/b8736b2c5490660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5fd7c21646666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_60168229c29a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_60673c9f4d081.pdfIn PDF document text
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/1d56748.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/pulibisafuj.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/bacterial_spores.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fe53aea38da9.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/fanesitewasunikigu.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/rarukifagona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6063fdf7d4cbf.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/welikojadeduzovovor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026f9f1822dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekuwomexapa.myartsonline.com/28011862343.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/what_are_all_the_names_of_god_and_their_meanings.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/hayward_pool_heater_error_codes_lo.pdfIn PDF document text
    • http://degevojorak.myartsonline.com/31360638675.pdfIn 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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 5440 bytes
SHA-256: 55358c32b2da8c60942d75861e8f68aad4ca36afadfb760c6cec62ba027dffbc
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10396 bytes
SHA-256: 8afbfe2142280a1f258a5dbb0d0281854b79c8f69cb8dc078da97cbbda21a07e