Malicious PDF — malware analysis report

Static analysis result for SHA-256 2231c3e5057e3eb3…

MALICIOUS

PDF

93.9 KB Created: 2021-05-01 08:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 48449f0d1534552e8e9bc9830307b6fb SHA-1: ad1de1f198d4edfdfe21f471e4903e704732b8c4 SHA-256: 2231c3e5057e3eb32b0445926df5e5e9f27b041b287cb96730bc4a340cd58483
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, indicating a phishing or ad-revenue generation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://pelibifir.ru/strik?utm_term=what+is+a+neon+santa+dog+worth+in+adopt+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501660/normal_603a59c145d9a.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/dewixevoxidebe-nunelizewuvele-dafufekerino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_6065f21e97b31.pdfIn PDF document text
    • http://gooddevice-online.com/juwudafat3a7.pdfIn PDF document text
    • http://reetodo.online/army_dispatch_procedures_powerpoint1q6aw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_60158794ea72f.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/finonimuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_60325d994322f.pdfIn PDF document text
    • http://all-casino.xyz/what_is_the_meaning_of_true_colors_song5l807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_605c482fa9c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe826b9c37c1.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/xaligen.pdfIn PDF document text
    • http://4gusevshop.website/true_metrix_control_solution_level_1_msdsfb47r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601b30588e0f1.pdfIn PDF document text
    • https://wojowoseda.weebly.com/uploads/1/3/4/2/134266381/banaw.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/melokorofukigib.pdfIn PDF document text
    • http://shoppermarket.online/the_voter_by_chinua_achebe_summary3a4fy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44de9dca-2aa0-482f-8e86-4dab800a5176/gadax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d90ae67-847e-4f61-bb32-80bc1fd5c306/kirkland_signature_hearing_aid_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0971610d-0a61-4b35-be82-7a65ed0aca13/how_many_words_should_my_24_month_old_be_saying.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
    • 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_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 5444 bytes
SHA-256: 94041d85e1503ceba91b0c0c40f85e4c74eefbac120acd17bc7c7228b2aaabce
font_01_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 12228 bytes
SHA-256: 19a3d82df65fb95d9ab6ce700d741f1e18f259c58d33daeb05215d61eb59a997
font_02_sfnt_off0001531f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531F 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550