Malicious PDF — malware analysis report

Static analysis result for SHA-256 851e89ffe3baa016…

MALICIOUS

PDF

96.6 KB Created: 2021-03-02 13:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2676d72ddade83ef38871d7a1444a941 SHA-1: 59eeaf635c2a9c264006a60481b97b6821acc407 SHA-256: 851e89ffe3baa016989ae58fce00575441e60150314c0df7869be5f2fba9aa25
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a product manual, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=vizio+sb3220n-f6+32+2.0+channel+sound+bar+manual PDF link annotation
    • http://ginupedarokuxu.getenjoyment.net/siriusxm_hack_crack_2018.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/can_a_caldera_erupt_again.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/wgjjchj/xevonobenag.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/what_does_audacity_mean_in_a_sentence.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/ragifapimepajogeb.pdfIn PDF document text
    • http://lg-supportteam.com/pam_grout_e_squared_freeap48q.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/is_call_me_by_your_name_on_netflix_germany.pdfIn PDF document text
    • http://unosital.space/app_to_screen_record_apple_musicjwa5j.pdfIn PDF document text
    • http://medesutaduj.22web.org/30732608190.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/96119424731.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/22888680188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juxudawalugevop.epizy.com/26308982459.pdfIn PDF document text
    • http://mujujum.epizy.com/gedopijudavenel.pdfIn PDF document text
    • http://tonesovuxor.rf.gd/pudun.pdfIn PDF document text
    • http://povorafolopoxap.epizy.com/cerebral_infarction_with_hemorrhagic_transformation_icd_10.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 3368 bytes
SHA-256: d87be38e49c7005f6b3c4eae06c96969507607b505e4440f53184f2af11477db
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 6072 bytes
SHA-256: 1791d150a5ab222d73a52f6549439d58c4c8d784f0e9b26394620f54d383f9a9
font_03_sfnt_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 12736 bytes
SHA-256: e9ae6562ffa3896fd76b3b0dd9a6253758fe63b01805e89fba825e9fe1f57e9d

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