Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac264e84cab0f2e4…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 22:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0245a4066d9d70e6cebeeb3d48a819e5 SHA-1: 960e253b2a937bdedf5fb7073810f9fc0d1b930e SHA-256: ac264e84cab0f2e4935dc41a37c0b08aec59a0a2a4f64232d56293a81e19027f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. The document contains numerous embedded URLs pointing to potentially malicious or scam-related content, with one URL explicitly linked to known malicious redirector infrastructure. While no scripts were extracted, the sheer volume of external links suggests an attempt to lure users to malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/award?keyword=anamnesis+pdf+ejemplo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_60222ffe7b884.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/7010596.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/kenmore_700_washer_repair_manual.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/gomikojirirufetotim.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/is_the_lg_stylo_a_good_phone.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/piwefite.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/wavunasudiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fddc1892696f.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/galamopoxepedadom.pdfIn PDF document text
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/7171540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_602cb023c6661.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/6a3c059949c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fef3df52a655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60411f7327ba5.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/jdPujeK/best_ice_cream_flavors_baskin_robbins.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/hbqBKhb/fun_words_that_start_with_be.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Thctjju/best_deals_on_apple_watch_series_5_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/D54hbhf/huey_helicopter_sound_vietnam.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/is_it_worth_buying_cyberpunk_2077_on_ps4_pro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefowolo.atwebpages.com/26250568807.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_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 5156 bytes
SHA-256: dd1af835542ddc6538d3d89b23c7c7f849944e27a4cc164d4499e2bd1bb93d19
font_01_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 11748 bytes
SHA-256: 68a97f4314ec6f1af808d044ad8356d968ef0f68fb4f74133d12e1212f635130