Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e347db70e110b2…

MALICIOUS

PDF

94.7 KB Created: 2021-03-27 16:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 94709ad26f3cd941f59b99e0489c7be5 SHA-1: b1bc96fe3ffe2a1440da8cbe4ca5b81e5cdf6319 SHA-256: 04e347db70e110b2aafab360aae767fec8118db5810a54a45b46b3f14ed2a664
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 hosted on disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://leonvi.ru/award?keyword=asvab+electronics+study+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/fiwujumejuf/Fjaggc7/used_drum_set_for_sale_philippines.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/65595163965.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/gdIHgjM/amazon_seller_app_store.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_to_find_acceleration_due_to_gravity_at_different_altitudes.pdfIn PDF document text
    • http://repair-foto.ru/38037471154j12y2.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/quote_from_huck_finn.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/breaking_off_the_engagement._bring_it_on.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/iggdmoY/kavelobosenugogusalanol.pdfIn PDF document text
    • http://electrumwallet.buzz/3498922011303fne.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/44957766351.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/Mhdgejc/90203473923.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/gdvVjda/27353693648.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/dgj15gh/free_music_download_app_for_iphone_5s.pdfIn PDF document text
    • http://kapusta.pro/16187774923obbsz.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/RO9gFje/car_gear_shift_knob_custom.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/nusawivoposejigojmw053.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/ja0ihhi/survival_planet_der_affen.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/YJuFO30/lediwura.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/bsijrzQ/pikavavafabavovirub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_824f24b6f2fc45c6ac394e4534db611a.pdf?index=trueIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/kadun.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/93995590230.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_3576296b84e44888a37aa06ea5826993.pdf?index=trueIn 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_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 5616 bytes
SHA-256: b4f0d5ef9cf00b8d5511b819d3ec7b32a44090693ec9e1f821dc7f916f79608c
font_01_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11308 bytes
SHA-256: f800db32a4414005007b062ae89a859c7eb2bf7aa171d0b1fa7a39f1b1e01e26
font_02_sfnt_off0001577d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577D 16156 bytes
SHA-256: ee5511fe5e0e5021c49a8fb83ee794eb36932b59c899ce146f4c063ce36da335