Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d7eab77acc74fe…

MALICIOUS

PDF

83.6 KB Created: 2021-02-28 07:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88d9161b7f0611dcf9dadfa5ce7768d3 SHA-1: b3b94c816baa4c6109bad13063e6f0f570071d24 SHA-256: 44d7eab77acc74fee93792b3b18d09e9f1eaf1c77f9ac4c51be4c51f9be4773e
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/aws?utm_term=what+is+the+best+modem+for+optimum
    • https://cdn.sqhk.co/goduwonon/hjhgvjh/colors_of_the_wind_vanessa_williams_karaoke.pdf
    • http://chategratis.online/how_do_i_reset_my_polk_magnifi_max0tejn.pdf
    • http://mudelukise.iblogger.org/cross_platform_react_native.pdf
    • http://itclick.info/darn_tough_size_guide94ipt.pdf
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/670002.pdf
    • https://cdn.sqhk.co/jezaziritav/LL8hgja/solid_color_wallpaper_iphone_7.pdf
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/kilixatepapo.pdf
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/gazumejit.pdf
    • http://cmbclientes.com/kailanan_ng_panghalip_panao_worksheet3gvab.pdf
    • http://dlkmvkoenv.info/naxuxet876de.pdf
    • http://helplnstagramcontact6088756.com/96698997623y7tsu.pdf
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/temejirelomogek-pivef-demubune.pdf
    • https://cdn.sqhk.co/jarixizotib/CPgihjt/flickr_photos_download_chrome.pdf
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/0bf56cee3860.pdf
    • https://cdn.sqhk.co/wujakegu/wgegfif/studio_photoshoot_ideas_male.pdf
    • https://patokepejiven.weebly.com/uploads/1/3/4/7/134706466/3337349.pdf
    • http://bafalumej.iblogger.org/chellamey_songs_starmusiq.pdf
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/c3e8425b2041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vudagolefedofa.epizy.com/paytm_first_game_answers.pdf
    • http://kijijaxozaro.epizy.com/exclamatory_sentences_examples_with_answers.pdf
    • https://s3.amazonaws.com/xakapudakadu/include_html_template_in_angular_6.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71d.bin
a9bbf1f152ea3e3253159f21eed5eabf724cd5cb3f7016fb0bc3bdb319a0f938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 6812 bytes
font_01_sfnt_off00010854.bin
8c24a85ddbcc409870dd6b348fc49c19cb2355d34496f31960bd04b4fe925bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 5400 bytes
font_02_sfnt_off00011a8d.bin
490c10e4785d5872714f1d51392d618911bc7f286ab0fcaa4745e960f31d509c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 11176 bytes

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