Malicious PDF — malware analysis report

Static analysis result for SHA-256 0460c5d18f116277…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 19:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ed178fb7ea21826bc0b50dec5d23f8d SHA-1: 96c0acfcbb4413e851006f988352f8751c9ea065 SHA-256: 0460c5d18f116277bbad82900a170a1b3181dbcce27d87d0b30139babe1b43b2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=elements+principles+of+design+in+architecture+pdf
    • http://nosinoski.shop/6264590g8i02.pdf
    • http://ruwazumusef.scienceontheweb.net/ferraillage_escalier_bton_arm.pdf
    • https://bakuzasopawej.weebly.com/uploads/1/3/1/4/131408369/7875032.pdf
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/kumejesalarusixotowi.pdf
    • http://ripugusulufiluj.getenjoyment.net/gingival_keratinization.pdf
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/wuvogeronoweko_wopap.pdf
    • https://zixulelivu.weebly.com/uploads/1/3/4/5/134507035/wivutikifaw-gibigabet-wovelalax-pasisa.pdf
    • http://pl50off.info/star_wars_empire_at_war_forces_of_corruption_republic_at_war_mod_downloadduf3j.pdf
    • http://sitizinudex.getenjoyment.net/monstrous_nightmare_book_of_dragons.pdf
    • http://sixesijilolun.mywebcommunity.org/polk_audio_magnifi_mini_sound_bar__wireless_subwoofer_review.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/danazejid.pdf
    • http://zuzorovix.scienceontheweb.net/raleridex.pdf
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/sukez.pdf
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/wubuvazepi.pdf
    • http://legibovusapezo.mypressonline.com/cs_lewis_the_weight_of_glory_sermon.pdf
    • http://fotubobuwenapu.scienceontheweb.net/95382146507.pdf
    • http://dsv-trening.ru/how_to_add_an_image_to_a_header_in_wixhyq12.pdf
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/fobakex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1f81be01-89bf-427b-972e-5750bdfaebe1/82029284685.pdf
    • https://uploads.strikinglycdn.com/files/8b8b064b-98df-489a-bf09-7523f4b1fe21/jipidozaguwodar.pdf
    • https://uploads.strikinglycdn.com/files/1abb0c8a-6739-4c69-9c8a-8fc38bdf31ad/56448263529.pdf
    • https://uploads.strikinglycdn.com/files/939b0898-3302-471d-afaf-ac376425e970/chess_tactics_puzzles_apk.pdf
    • http://fixiwajavonuti.atwebpages.com/pirezedujukag.pdf
    • http://zegetafirotazaz.atwebpages.com/29562410931.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_off0000e943.bin
d9fbd82b0a8aace7fc11a750f87e996d4bd28974c9deac0df622165f3981633d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 5524 bytes
font_01_sfnt_off0000fbe1.bin
12e079afc94c5f333e840227b297ff33047014dc2942dcb0fc07a68b3d8d6e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 11024 bytes

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