Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e9dc404e61bb12…

MALICIOUS

PDF

77.5 KB Created: 2021-01-22 02:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 73f145789f47af62de04c5ce69d5b56d SHA-1: e6fc1da636e06fabb021d6e25cf51b64c2eedc7d SHA-256: c3e9dc404e61bb129ed927a8e4da48933909144f94deddcddb71c364879f1a79
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or scam attempt. The presence of 'utm_term' parameters in some URLs indicates tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=richard+branson+casino+royale+james+bond PDF link annotation
    • https://cdn.sqhk.co/jobiwokojo/gdnZ0jh/roblox_gift_card_codes_2019.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/foras-vipamulibumuk.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/1490605.pdfIn PDF document text
    • https://tuxabonelunod.weebly.com/uploads/1/3/1/3/131379680/lozugudax-kupopexikobuv-baxat.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/ThiysTv/comment_recharger_carte_rapido.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/gcyCWTF/cube_surfer_online_unblocked.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/robumuduluwise/erythrina_poeppigiana.pdfIn PDF document text
    • http://nirutavikuda.epizy.com/zonag.pdfIn PDF document text
    • http://durunorutap.epizy.com/witodenugukeru.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/42442043763.pdfIn PDF document text
    • http://tubulufegufixo.rf.gd/92755043412.pdfIn PDF document text
    • http://babudenipovux.rf.gd/64518019633.pdfIn PDF document text
    • http://wosumobikufiw.rf.gd/bully_obb_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/29086036395.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/aalco_aluminium_data_sheets.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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 5504 bytes
SHA-256: dc925b3269348c4df1a5960ca36600d7f4bcea0202ba15510b5456304628fb3c
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 11540 bytes
SHA-256: 3668f960d1846060fcb785612db93011ea2544e8e866c8e4d0c7b86bd852ecd3
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 16336 bytes
SHA-256: e537662d6463a2784834b996875f718ccba226796a3d0693c7d7fee402deaf2e

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