Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fab4cd51079a832…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 11:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2dfa297be2c0ed265ef94b003dde44d9 SHA-1: 81cccbd912508d21529fdc2580b3b10a6bb50c1d SHA-256: 1fab4cd51079a832f8c4c8c6883858e6ae7120e8679bb91777557fad6153c9b6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links pointing to other PDF files hosted on disposable domains, indicative of a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://mezovuduw.ru/award?keyword=physiology+book+by+ak+jain+pdf PDF link annotation
    • http://woziwowariv.sportsontheweb.net/golf_buddy_vs4_wristband.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/hfWhauP/partial_license_plate_lookup_texas.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/kazogimagibap_vawegudititu_goxifo.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/a39af17.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/bepuvajovopodi.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/vunegiberus-wumupefiluri-kuwad.pdfIn PDF document text
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/3007551.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/silibudoviwadili.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/e33d5058b29a.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/iiGhaid/meraxadoburopugidaresuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/Jsgedxl/86601602480.pdfIn PDF document text
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/6610654.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/5ibDjsv/selevete.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/bekinivi-merozorovudur-zajopifowuluko.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/tugep.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/5gfUoqC/lujuwakexewad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4841e4-5bbd-49c4-92a6-e1940fef8642/xelukufagazagevozeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c685868f-ccab-4f60-bdb1-5c23518c025b/xajizazaboworatexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e1e3be-6d84-4801-bb03-9622cf2f69b1/where_are_the_indian_mounds_in_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2d0724-4b93-413f-bcc4-68adabe702d8/46031028287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ba6192-22c7-4b4d-b8d6-99c04a5a90b9/7_ps_of_marketing_mix_ppt_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5592 bytes
SHA-256: 66a47fcb668313c1aba669b2a3a88a0680b1600651518ac9f9d40344fa0ad107
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10584 bytes
SHA-256: 21b90819d11eda182ff3be964cb8b7aa8aa723e7add5a7c73a1c3cac0cefc370
font_02_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1