Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad9e49acc842910…

MALICIOUS

PDF

74.2 KB Created: 2021-04-18 22:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b133e5e21bf13a48f66dc518794d18d8 SHA-1: 2fbcfa960abf289f1fe3daa64b0a946bc98cd808 SHA-256: 8ad9e49acc842910e013332de811f00688561680051fdfdf6aac8931cc9948dd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and another using a UTM tracking parameter, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://lozipotod.ru/strik?utm_term=mr+coffee+food+dehydrator+replacement+trays PDF link annotation
    • http://vitavolu.22web.org/dakigitabibixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff003b776302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_60480fdd5c57d.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/47279791289.pdfIn PDF document text
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/7852908.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/4497573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_606886738a827.pdfIn PDF document text
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/02ded65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fd79765cc923.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/pneumonia_bacteriana_em_caes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_603031b46843a.pdfIn PDF document text
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/865303.pdfIn PDF document text
    • http://bipamujiwi.iblogger.org/mibegoriwovigudufuravu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zaxokejik.rf.gd/20622801271.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/orbit_er_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/6925403588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe0966e-1185-4b12-919a-64b4f1ed33f9/lojorokiwugakezagowilufo.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/what_does_english_comp_1_consist_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7ce765-89ca-4e28-b0f3-c130d1279749/ssis_tutorial_gateway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb3f34-2f5d-4fac-be73-fd84021ab87e/ruvesizuxekobuvirolikirad.pdfIn PDF document text
    • http://bewaxupu.rf.gd/what_are_adventure_games_in_physical_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9982c3f4-6019-4f18-b683-66545a0a3d58/honda_atf_dw-1_where_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/top_kpop_songs_2018.pdfIn PDF document text
    • http://febarufowit.epizy.com/purpose_of_argument_from_desire.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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 5244 bytes
SHA-256: 69ab638d0d9332c99e41cce46fdeb56f3d22450e4a6f1a4045e5fcff83b76cbe
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10340 bytes
SHA-256: 255cf03f19dd3b3e36e24fa9f5f522fa04480524f897a72add4af7d99fa415a4
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333