Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c680df5743124ec…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 06:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d38b86485f7ab0743925b687c8c8dfdf SHA-1: ec9fcc17e813ec405af864a58d6ccbfd5e3349cd SHA-256: 7c680df5743124ec695806bc5f4161681728c1da4b655132d62ba287c8a857da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains, likely to distribute malicious content or phish for credentials. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=tank+trouble+swf+unblocked PDF link annotation
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/2928153.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/tikabexer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5fc6b09ef34fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_602934da43571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fef01b394338.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/jCyYhfR/fps_gun_shooter_counter_terrorist_shooting_games_uptodown.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/sinobeb.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/7107869.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/togogidubumanelapow.pdfIn PDF document text
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/0042ed16280.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/sosefufiwanuzorenole.pdfIn PDF document text
    • https://jutabuja.weebly.com/uploads/1/3/4/6/134666284/9185511.pdfIn PDF document text
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/pixerovujixinex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_60128a0107ea1.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/vatafexu.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/soxisibupisajus-fokubu-vatetega-businikujaxi.pdfIn PDF document text
    • https://pezujereg.weebly.com/uploads/1/3/5/3/135349759/5632017.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/f1Gjijf/first_words_for_baby_colors_shapes_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/3Cjicgg/40280355326.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/xomasiv_wapavifug_nofirapet.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://figijosi.epizy.com/falereferolofabiwiv.pdfIn PDF document text
    • http://xevorerokune.epizy.com/11588775399.pdfIn PDF document text
    • http://luremugaxufarup.epizy.com/calendario_2017_para_imprimir.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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 5096 bytes
SHA-256: 6f3549f1321ece73b2c86769839163afb42b05635690eeac18364eb6c2444354
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 9908 bytes
SHA-256: 9dc1aca388e66d44144dad6f3f32457941db759d5ce6f3077c3fedb1e0761b84
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2