Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d1fba561654b30…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 12:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 745060b2eb2f05008e6879bfe6132661 SHA-1: a4500f34b433133e30d74d875d5672594fb4d096 SHA-256: 89d1fba561654b3023ac9257acb9c58aa4495aebb7aec2a74efd212f81d53f13
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_RANDOM_URL_LINK' strongly indicate a malicious intent to redirect users to potentially harmful content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://hotelamadeustorino.com/userfiles/files/73228497306.pdf
    • http://arqing.es/ckfinder/userfiles/files/xuzopivavuxirijoz.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11112776365.pdf
    • http://minhanh.com/files/xilukisogemupikira.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/74563940626.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/1015039115.pdf
    • http://damutech.kz/upload/2021/09files/210902150529704707k5t8c.pdf
    • https://giriconsultancy.com/content_files/files/nirepaxajibiwud.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/gufobepufokufigigajaji.pdf
    • https://obermeyer-modemarkt.de/upload/file/matupopilawedanave.pdf
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/6420475118.pdf
    • http://seoulsquare.com/userfiles/file/28679455222.pdf
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdf
    • http://letsfinal.com/userfiles/file/kokipawimitekuvekowewed.pdf
    • http://kemnhapkhau.com/upload/files/tijugimikirowilefevu.pdf
    • https://ehlibeytalimleri.com/resimler/files/rorofuduk.pdf
    • http://mim2010.ru/userfiles/file/37322887529.pdf
    • http://antifftech.com/uploadfile/file///2021091018453262.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307186769832.pdf
    • http://cpviettin.com/upload/files/wedesizimekikifizepusaru.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/03/85078442724.pdf
    • https://ntiverification.com/userfiles/file/jemojexipebaxateduwugame.pdf
    • http://files.ibiza-ferien.de/file/bixibokiwafexufomolaki.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vusidovojapexigu.pdf
    • http://www.sandipmallick.com/fckimages/file/bapopulutawikarigos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gba+emulator+apk+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de56.bin
2b923bc7ffd37e29d9936580595bcfab8c87bdd45f0a39085005dd1bb8fc3bda
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 10540 bytes
font_01_sfnt_off0000f635.bin
cfa07c359b802f5582a7d7b95daef7544ceac6bde3425e34ef9ff0915cc05445
pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 17732 bytes
font_02_sfnt_off00012441.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes