Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35d72011ccf65a7…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 08:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 319b18e2d3035810a1197b3347a969c7 SHA-1: d0309b53191c64377bd8ac20a2ebaef39cb336ae SHA-256: b35d72011ccf65a7a6022ed8180679ac5da1ffe2066580196f68c90d26ee3528
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The primary URL, https://nipisod.ru/strik?utm_term=how+much+does+it+cost+to+take+the+written+driving+test+in+oklahoma, suggests a lure related to driving test costs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+much+does+it+cost+to+take+the+written+driving+test+in+oklahoma
    • http://changely.club/2002_polaris_sportsman_400_manualxs5kj.pdf
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/319509.pdf
    • http://pressit.space/accu-chek_fastclix_lancet_drum_reuse1xnky.pdf
    • http://solent.bar/allen_carr_easy_way_to_quit_smoking_reviewddmnb.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/warate-naxigovot-roketodob.pdf
    • http://teaapple.space/movistar_colombia_roaming_europaf0tzl.pdf
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/2213811.pdf
    • http://fasumidivojasuj.iblogger.org/android_10_release_android_one.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59d9ec55-7adb-4d2d-b049-474250735dff/anne_bradstreet_to_my_dear_and_loving_husband_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/1f3a5d7b-b874-4c4a-945b-eec3e765d9d1/lodepumewa.pdf
    • https://s3.amazonaws.com/mogipegi/interview_questions_to_ask_account_managers.pdf
    • https://uploads.strikinglycdn.com/files/75935dad-1014-4126-a4d4-133dcb874933/free_worksheets_on_idioms_for_3rd_grade.pdf
    • https://uploads.strikinglycdn.com/files/1320f36d-3bbb-48ef-b6d0-f5ed9f9f7c81/the_uses_of_enchantment_bruno_bettelheim.pdf
    • http://lavodusepigixu.rf.gd/formal_email_writing_format.pdf
    • https://s3.amazonaws.com/pasutiz/nitro_reader_free_download_for_windows.pdf
    • http://xanomake.epizy.com/solving_exponential_equations_grade_11_worksheets.pdf
    • http://luvebex.rf.gd/1864322341.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37c.bin
dda935fbca22011be8065c12a57a27522c373f9bd7c0ea1cea1d4c02a145abed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5532 bytes
font_01_sfnt_off00010634.bin
9012b0cbe11ba910f28ae56d06f3dcaf698e0569b0cad4fcd81cc723f1b10f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 10092 bytes

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