Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8de6684860684b…

MALICIOUS

PDF

83.0 KB Created: 2021-05-25 03:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bfc072d965c5b4b0b9db77ad5d2819 SHA-1: 98412a4c468728a3ebdbc876c93232390583ffbc SHA-256: 5c8de6684860684b66e510d15188c1af0d32429bc582feb1191e6a24d5755d9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a site offering a 'Sims 4 product code generator online'. This suggests a phishing or scam attempt, likely to trick users into visiting a malicious site. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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/strik?utm_term=sims+4+product+code+generator+online
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/6db79430532da.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/badexisesoxifir.pdf
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/koxena.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_604bbb8f254f5.pdf
    • https://cdn-cms.f-static.net/uploads/4411683/normal_6041e666e99c7.pdf
    • https://lupagizan.weebly.com/uploads/1/3/1/6/131637074/litevufazapukar.pdf
    • https://cdn-cms.f-static.net/uploads/4471273/normal_60200e13e190c.pdf
    • https://litisowof.weebly.com/uploads/1/3/4/6/134692954/44f4a3.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/garinalapufe_pafifapezi_mupaja_virizune.pdf
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/4771426d5bd5e0.pdf
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bc971c9215.pdf
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/1950559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tevigotu/chief_examiner_s_report_on_wassce_2016.pdf
    • https://uploads.strikinglycdn.com/files/73c5642c-6f0e-4c9a-8a1e-6283286a1c4a/que_contiene_sodio_y_potasio.pdf
    • https://s3.amazonaws.com/mubefula/kurogubuxarewunokatet.pdf
    • https://s3.amazonaws.com/gozifep/cerebriform_nevus_causes.pdf
    • https://uploads.strikinglycdn.com/files/0e0770c4-21b1-4c52-a6b2-100c7187308a/cdigo_nw-3-6_na_netflix.pdf
    • https://uploads.strikinglycdn.com/files/3b9326f2-4d23-46a7-ac60-942b77993af7/nawonimigoguv.pdf
    • https://uploads.strikinglycdn.com/files/5500a214-c155-46aa-b33d-cb5d56133505/tascam_388_ebay.pdf
    • https://uploads.strikinglycdn.com/files/aef7c9e5-71a9-49d1-920d-4858510c8b87/1428718729.pdf
    • https://uploads.strikinglycdn.com/files/b5665106-b3c2-4b3e-b14e-6169164e9c95/burger_king_fries_nutrition_label.pdf
    • https://s3.amazonaws.com/tometubufimopim/unication_g1_pager_alert_tones.pdf
    • https://uploads.strikinglycdn.com/files/f42b790d-cb84-4219-bce7-8cd874cebd9d/schedule_bulk_trash_pickup_pg_county.pdf
    • https://s3.amazonaws.com/purixifusipelid/80953292045.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_off00010706.bin
3e5d5bfcef58b8fced8b2f6f462bc0b0e961307b4beb5b8a02d61524ce7db182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 5584 bytes
font_01_sfnt_off000119f9.bin
9eafa00bbe23ddda9f5e68d90c44959c03e1ab6b8b229c1720f6a7e8b804f88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10760 bytes

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