Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb504ca0684b09…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 04:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c5f116ebe92b243f54ed0b2750bbe22 SHA-1: 5840e68b18d9aa18afd0fe25037417e2e33fb28a SHA-256: c0bb504ca0684b09db22ce568f842dd9465a6418cfe590363f85f2340799f28d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure and a high ML classifier score. The presence of a large link farm on disposable hosting suggests an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered via spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=bblsr+adalah+pdf In PDF document text
    • http://forsage.pw/data_analytics_using_python_book0tl2s.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/gchj6jh/68920111684.pdfIn PDF document text
    • http://itrom.fun/lang_leav_love_looks_pretty_on_you_quotes1gi3y.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/chgjcin/optometry_australia_medicare_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/rlgjojj/xfinity_streaming_box_hbo_max.pdfIn PDF document text
    • http://italylife.pro/amazon_prime_dirt_bike_partslswmy.pdfIn PDF document text
    • http://peludofnor.fun/763247198861e494.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/gfghwgi/islamic_sword_wallpaper_hd.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/the_economist_world_in_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/jYidSie/godadutuxori.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/WfjbPhf/green_pepper_nutrition_data.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/dihhgnc/reborn_dolls_shop_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/fidinananale/AgfI9hu/40430626011.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/gdNTje6/49068200852.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/toliwudalamem/16072081400.pdfIn PDF document text
    • http://givesal.rf.gd/65637532734.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/how_to_cancel_rosetta_stone_subscription.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_ac8d3f88c66a49269c942bb38f209e3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/mikad.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_d1c0ba1a57ef4924aacbf8b5b74a9ef1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/gameloft_asphalt_8_pc.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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 5316 bytes
SHA-256: 05581e90b2def827e63a5bd82048bae003e808f3e05522aa3346a1332344e0b4
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10068 bytes
SHA-256: 67fef9827390e36ff5dc81864e1eb66bd95cdea6632165f831a3fe1100c766ed