Malicious PDF — malware analysis report

Static analysis result for SHA-256 7254df6eeb7fe537…

MALICIOUS

PDF

117.5 KB Created: 2021-03-12 10:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a393636262770127b05c7bed2b790c61 SHA-1: b9c42d170f0acbe4d01b614e537732406f4131da SHA-256: 7254df6eeb7fe537a4296cfb89da8fe2c85c8a177faae4fbf407867a4d2e1e3c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://nipisod.ru/123?utm_term=advanced+accounting+1+guerrero+solution+manual PDF link annotation
    • http://trellos.fun/pre-_ap_chemistry_dimensional_analysis_worksheetiy4q8.pdfIn PDF document text
    • http://daliadiago.com/sole_f85_treadmill_sale_canada5z6qa.pdfIn PDF document text
    • http://optamorem.com/nusexasegizerefarevaxuzhpn0p.pdfIn PDF document text
    • http://peteferix.mypressonline.com/how_many_decibels_is_a_dishwasher.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/fadupuwumapakos.pdfIn PDF document text
    • http://jolawusivig.iblogger.org/catalogo_avon_campaa_17.pdfIn PDF document text
    • https://betijefozivur.weebly.com/uploads/1/3/0/7/130776077/5589828e8.pdfIn PDF document text
    • http://excellent-spb.ru/lilefavibume9m7sb.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/padetuwubebudo.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/1gfyKVN/41226988169.pdfIn PDF document text
    • http://bitcoins-profits.com/vicinity_centres_financial_reportxfe75.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/Nhi0tgd/fumovalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00d639d-69ea-429b-86c3-278a9f2391a2/what_book_comes_after_the_last_hope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb9c5be-1712-4e34-9d09-d45982235d10/is_panda_express_bad_for_you_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61758689-92f0-40e5-9a22-69945317a5c0/heart_of_darkness_movie_netflix.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/what_is_10_to_the_power_of_minus_1_mean.pdfIn PDF document text
    • http://kujafugakare.epizy.com/rpr_6mm_creedmoor_load_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ca57b1-d966-40fa-a007-edf7b384be75/gisafalaguzovi.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/kumon_workbooks_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e9a180-58c3-4e89-899b-c6ea75501b29/how_to_buy_ticket_nj_transit_bus.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/john_deere_2653a_owners_manual.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18146 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00018b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B89 5360 bytes
SHA-256: 13c255989b74584a4c5ab709ab926e40924025143eaa4f922032d888fffffbfe
font_02_sfnt_off00019db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB9 12872 bytes
SHA-256: 7128c0e8228a35bb07fb80825b3dfa2c73dd09345e09beb7e8f18e29c28db754