Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1d62e8a1c941c3…

MALICIOUS

PDF

68.2 KB Created: 2021-06-06 15:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9b362e3d767f60b6d665a3a72a9d7d0e SHA-1: c6c6b95f289372789fd54b249686f19fd16b3608 SHA-256: cd1d62e8a1c941c3e637ef10c5b60ee4bdda1d95c2257e42aed1ebb2148e8227
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, characteristic of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

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://crysiq.ru/pbw?utm_term=solid+state+physics+by+j.p.+srivastava+book+pdf+free+download PDF link annotation
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/lolivopijunepabafe.pdfIn PDF document text
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/tedex-fitisatinujevi.pdfIn PDF document text
    • https://masevaru.weebly.com/uploads/1/3/5/3/135346062/bexinujuzetanadomera.pdfIn PDF document text
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/3927644145dea64.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/mipete.pdfIn PDF document text
    • https://papadapogapov.weebly.com/uploads/1/3/4/7/134706375/45a8e49c3bad9.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/366c8c2a65a2e.pdfIn PDF document text
    • https://runobutadafe.weebly.com/uploads/1/3/0/9/130969205/8aca4a6a.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/vukafakux.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/jezomatafazuw.pdfIn PDF document text
    • https://kivoranove.weebly.com/uploads/1/3/4/6/134679810/lupaduwa.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/3593204.pdfIn PDF document text
    • https://sujufejunuvevu.weebly.com/uploads/1/3/2/8/132814923/xekutonujesojobaba.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/1075458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421821/new_bible_dictionary_3rd_edition.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/pulunavubejatagazuvub.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144655269/how_to_get_bloons_td_6_for_free_ios_2021.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/hack_para_among_us_mod_menu_apk_download.pdfIn PDF document text
    • http://tovovojufa.pbworks.com/w/file/fetch/144669666/janenofulajenibilakuvipir.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144538635/what_is_r_in_pvnrt_for_atm.pdfIn PDF document text
    • http://fisojun.pbworks.com/f/cuanto_es_300_gramos_de_harina_en_una_taza.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_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 5912 bytes
SHA-256: 27d2db35abb8adab9b748bfd82c042740d44470904d5961fc9ab719042e0cfd2
font_01_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10620 bytes
SHA-256: d28b2fea20dfbff8e49c0997a0494d4ce8157c891ff954a305a45674623d01f1