Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57adb11556ffb3d…

MALICIOUS

PDF

92.1 KB Created: 2021-02-10 22:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ff9f7d04e571efe33df45baa6e1e822f SHA-1: d71aa50e33434f3e2b2c96134dae2bc603553890 SHA-256: d57adb11556ffb3d7084d9ef3d61d02ecd757020d91c219ee68852608a6118de
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or engage in phishing. No scripts were extracted, but the PDF structure itself is designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=booth+multiplier+algorithm+pdf PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/gghc0ig/diy_wooden_gun_cabinet_plans.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/08d2465b3e007e.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/hhalihg/86391696197.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/3894633d4f6049b.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/RYjzcC5/petroleum_engineering_schools_in_new_york.pdfIn PDF document text
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/dumege.pdfIn PDF document text
    • https://cdn.sqhk.co/supekolev/NKUhaji/vowudemixenozi.pdfIn PDF document text
    • https://cdn.sqhk.co/poxudanefisi/XVFjciO/zuwoxatenareruvabibikitej.pdfIn PDF document text
    • http://repair-planshetov.ru/1932580992805xag.pdfIn PDF document text
    • https://rawofaweka.weebly.com/uploads/1/3/0/7/130775842/kigoso.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/gihijig/80s_90s_music_genres.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/YVgf8hi/vefododoso.pdfIn PDF document text
    • http://domen3.club/wrap_text_in_cell_with_php_fpdfwcprw.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/Fjj9jeU/bike_mayhem_mountain_racing_apk_cheat_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/haMufCP/doworelupilalarubanuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekofixas.rf.gd/wabupuzipav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 3048 bytes
SHA-256: a3a044f38c0744db317ddd527def711ace8d8b87a1961893ab295bad5a8f973b
font_01_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 5324 bytes
SHA-256: b3326ec530a599bdc44937979ceccf26ef20ca87f9d586d9173da0de87238e9d
font_02_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 11680 bytes
SHA-256: d50e2462ee543158a622e2a1327a1d4d5546d83ff223827da78d27c033bc1383

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