Malicious PDF — malware analysis report

Static analysis result for SHA-256 081595630d73878d…

MALICIOUS

PDF

101.1 KB Created: 2021-03-12 16:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42fbd440e21da90ff1714ce3ac9fc016 SHA-1: 224d003453386bfdeb3a3c109ff28695660ff475 SHA-256: 081595630d73878d58aec6a1570c84558b5de900b7f8ce92d4aa3a6361479e89
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/123?utm_term=land+bridge+theory+pdf In PDF document text
    • https://cdn.sqhk.co/vigesiji/bd5DhcH/yeezy_350_v2_bred_outfit.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/nimozijef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fe55836312b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6034e98dba4cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/ZygdnV3/gonolig.pdfIn PDF document text
    • https://cdn.sqhk.co/toxaxiked/jitijjq/eggy_numbers_to_100_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fe02b393fa91.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/8q76hgg/58819445170.pdfIn PDF document text
    • http://ximasoj.22web.org/bayliner_trophy_2352_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fdb05e207a14.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/946c52d.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/uid9jgg/road_racing_cars_for_sale_ebay.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/805e9319.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/mhhuYfY/solo_a_star_wars_story_3d_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/luxelula/21940595972.pdfIn PDF document text
    • http://wexoragojanugen.epizy.com/how_to_fix_a_kenmore_upright_freezer.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/manual_paper_cutting_machine_15_20.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/kajozomavixivepotijosaf.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/cara_membuat_google_form_di_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/21863698350.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_off00014c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5B 5276 bytes
SHA-256: d4d26c1b33a418519661433adcd76332c45c1a0ff5500c0da31cf7baa0e023c7
font_01_sfnt_off00015e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E50 12504 bytes
SHA-256: b176d00c59e065f3e8f33bce8c34b153514ede433c14b3e933363edb3609d2ce

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