Malicious PDF — malware analysis report

Static analysis result for SHA-256 b977c8d661acecf6…

MALICIOUS

PDF

92.0 KB Created: 2021-03-05 07:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc694f9fcaffc4957b6a6177ef717578 SHA-1: 1ade17ae4737eaa03a2ac07d9959519b73fe1522 SHA-256: b977c8d661acecf6965c380a45171be067e6724920e5600c856478216c222a03
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=angry+birds+2+mod+apk+uptodown PDF link annotation
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/306982.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/ec163418.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/7276284.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/7154425.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/ijFhccD/panenoxevitefisodiwaz.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/asus_xonar_dx_win_10.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/dhfwggl/joplin_high_school_football_roster_2020.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/929927364.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/icgegi7/spin_the_bottle_drinking_game_ymca.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/1hcYxgi/battlelands_royale_download_pc.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/are_keto_and_low_carb_the_same_thing.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/twilight_breaking_dawn_part_2_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/YH26Tie/cnc_lathe_machine_programming_operation_guidelines.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/05806254c8038be.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/2488be95-43f2-40cd-afb8-8def6a2a33d5/nanifatiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47183cbe-ba37-4923-afc3-c9c1fb38a7d7/42582144350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a4ea13-de9c-4c84-9461-64b4e4ed4ade/holt_chemistry_ions_and_ionic_compounds_worksheet_answers.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/kujodazutotesokotavupubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c613b8f6-8a2a-4916-8c59-94f2542dc7ef/61455431302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f71a76e-446f-407d-acc4-bace92605283/51531964526.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_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 5768 bytes
SHA-256: 1a2d2ac2f6f3ca90c6b1b594ce8eeb7e5101b664cc104a95a98a04272b953aeb
font_01_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 12040 bytes
SHA-256: a73ef81d7ca4c596bf4cfd159f7dec64e8095537d7d8d1c1336f77d0a0cc87ac

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