Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4a4da2243e8c3e…

MALICIOUS

PDF

90.8 KB Created: 2021-03-23 16:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5f0cd2627b1cf4c04e6d708c9dc1464b SHA-1: 409b610b5b534e60bebfa3848e97cfac1a69396a SHA-256: 7f4a4da2243e8c3ec3d3aaed54ea0ad9b1b4f992adb9589a5c56e91c316c3f4d
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, some hosted on disposable domains and configured with UTM parameters, suggests a phishing or scam lure. The document body, though heavily obfuscated, contains references to 'sarkari result' and 'railway', potentially used to trick users into believing it's a legitimate notification or information source. The PDF structure and embedded URIs point towards a potential JavaScript-based exploit or redirection mechanism.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=ntpc+railway+full+form+sarkari+result PDF link annotation
    • https://cdn.sqhk.co/gibuzini/hjhifoM/psoriasis_cream_prescription.pdfIn PDF document text
    • http://vifijes.22web.org/balu_mamachya_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/fxOjcHB/masha_and_the_bear_party_supplies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff30091c5bec.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/igjSjju/animal_jam_classic_codes_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/cefjgha/espn_chicago_bears_stats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_604913d18554b.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/ejbfAcB/rusoluzoliz.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/bAF7Wje/7_mages_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakadutof/how_did_they_store_meat_in_medieval_times.pdfIn PDF document text
    • http://vijamutekaga.rf.gd/dd_5e_players_handbook_vk.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_f49c2090eb9d40789d8f0bdd26b428a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/is_it_bad_to_not_change_transmission_fluid.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_d5f29c563da747ee90a2ae5f5aae7ec8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/how_to_write_well_structured_sentences.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 5388 bytes
SHA-256: c4781383ca59c52c9154d397d825475e9fa55c824edbf15a500557b264b0a420
font_01_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off00013664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 11676 bytes
SHA-256: 1f06bf1b51c3a2506f6603d4f273498aeda7f72f5e363a37602503f543cac310

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