Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db93f4728c0ce20…

MALICIOUS

PDF

81.0 KB Created: 2021-05-31 21:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a8c46c64a1e700a22b06cde377c197 SHA-1: 4ac0ed7063421d4e3af564b1a7e3e99e0d334716 SHA-256: 4db93f4728c0ce20111fa7fd1bb31a3ddf897de1782e3cca5bb986932a155b4b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=how+old+is+samsung+galaxy+grand+prime
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/6de6514f.pdf
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/xajunanatesef.pdf
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/mopenul_xobebiru_muxodixokomo.pdf
    • https://xelavizagak.weebly.com/uploads/1/3/5/3/135325118/lusidopozofe.pdf
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fd06b8df0c1d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4366312/normal_60b14c44c4629.pdf
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/lifixafabaze-kigetoguj-digezak.pdf
    • https://sunapibabe.weebly.com/uploads/1/3/3/9/133999858/5771345.pdf
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/6e306b77acc094.pdf
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/nusoguwigovulerujot.pdf
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fca90b71ae96.pdf
    • https://juleverut.weebly.com/uploads/1/3/4/4/134488806/tubupusopezasa_binabinerur.pdf
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/tikelagavezik.pdf
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/9099257.pdf
    • https://cdn-cms.f-static.net/uploads/4477637/normal_603e1184c51f8.pdf
    • https://xoluvujotu.weebly.com/uploads/1/3/1/0/131070376/1945668.pdf
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/xovidesinevurav.pdf
    • https://xisofufewazexi.weebly.com/uploads/1/3/0/7/130776718/dapor.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/javegizibuku-ravulire-mifeduwikaz.pdf
    • https://cdn-cms.f-static.net/uploads/4468530/normal_605d63e63739f.pdf
    • https://sotufipepu.weebly.com/uploads/1/3/4/5/134595957/2082043.pdf
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/kalobogizuboxudakaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/96d1c085-0387-4e46-aa3c-88e0ea26b203/when_nietzsche_wept_book_quotes.pdf
    • https://uploads.strikinglycdn.com/files/67dfe3eb-abcf-464d-8e1c-bedfcb1de422/3415931774.pdf
    • https://uploads.strikinglycdn.com/files/a7f46a5e-614b-4fc6-a225-1a2cee15e9f4/new_pinoy_movies_2019_free_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/1ca3c14e-27d4-4749-b153-7b29a53c5fd5/mars_attacks_full_movie_in_hindi_download_300mb.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd53.bin
6933abb293f6758c50bc98334e7226bae3571cb5732c2b69015e19e2b7aa94cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 5500 bytes
font_01_sfnt_off00011009.bin
7dff7567d61a125218fddde0576b406bc96e9c40170686cf84ca6a6567d8a20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 11156 bytes

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