Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e70d89205804fd…

MALICIOUS

PDF

78.7 KB Created: 2021-03-08 06:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 176e5b397a337862d79808c29f4d1201 SHA-1: d515b3d7c8c4e4d247caf1470964ebd91310dad6 SHA-256: d3e70d89205804fd258f1567d1174d766c448c1487714a59fec90900a7a13ecb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO spam operation. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=nordictrack+t+7.0+review PDF link annotation
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/f52e059.pdfIn PDF document text
    • http://0fruit.space/384767574092xt2t.pdfIn PDF document text
    • http://psychologyrelax.xyz/how_to_change_hot_water_heater_thermostatyqq9n.pdfIn PDF document text
    • http://kitusozuza.22web.org/fifasuxuvez.pdfIn PDF document text
    • https://kofosobi.weebly.com/uploads/1/3/4/5/134528260/fugozudat.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/pajasenegozedez.pdfIn PDF document text
    • http://artrosil.xyz/thetford_c400_cassette_toilet_seal_replacementzcxy7.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/xurev.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/7724496.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/timex_indiglo_ironman_triathlon_watch.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/gutasuwune.pdfIn PDF document text
    • http://tdsevsvet.ru/how_to_ignore_a_guy_who_ignores_youp8n8o.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/a32e355.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/d7718cf0-70db-4deb-9519-b48161c8044d/what_do_you_do_when_your_laptop_says_preparing_automatic_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69805f4a-ec9e-4cf5-b10f-90e4d75369c6/61496549690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5531c3-7aad-48ea-8e42-c1a93312cb14/how_much_is_a_mini_oreo_blast_at_sonic.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_bd3ba64e78bc42ce8967aa98961e2371.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7529d9cc-d970-4746-8045-5f654e1fcc1e/100_free_background_check_and_results_no_creditcard_needed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a510abc0-e7b6-4ab8-a2c4-640f3d17cd52/how_to_adjust_philips_respironics_dreamstation.pdfIn PDF document text
    • http://xadaxaxug.epizy.com/on_my_way_easy_piano_sheet.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2a577d6d1e594ebaac1a90c9d32980bb.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 5164 bytes
SHA-256: 3b8937e77c33c7a160ad750f0c6745453b448d9587bdf48c2cd4bc7d277c1700
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 11420 bytes
SHA-256: 379f42fc271ca3b768d37bf672000756acac44d2560792c1faee3e7f6c01f043