Malicious PDF — malware analysis report

Static analysis result for SHA-256 942aaf42dacfde80…

MALICIOUS

PDF

84.0 KB Created: 2021-04-05 08:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 983e65c74acee8195da229fce1dd7c77 SHA-1: ad97bb2d019a09a129a556c7c1ba43bf91fd11c7 SHA-256: 942aaf42dacfde800d4e5e2bda9c482427fa342d01eca31d7e14ea3431eab0d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/aws?utm_term=bosch+axxis+washer+operating+instructions PDF link annotation
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/robowalu_bebovigorinope_gixusadelakagaw.pdfIn PDF document text
    • http://novugatep.22web.org/25010631212.pdfIn PDF document text
    • https://faraxebeg.weebly.com/uploads/1/3/4/4/134475962/4258005.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/buvorukamudej.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/wuwuliroti-lirodopiwazaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/fxUt1ia/healthy_vegetarian_recipes_for_weight_loss_uk.pdfIn PDF document text
    • http://sewaseg.22web.org/ayatul_kursi_urdu_tarjama.pdfIn PDF document text
    • https://wepidunobon.weebly.com/uploads/1/3/1/4/131452842/rovor-xemanufejoz-nepates.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/7109615.pdfIn PDF document text
    • http://dowakofevumamol.22web.org/17690610247.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/rogijadiwe.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/gemadirokaforomuvuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://ziwugedaxuz.weebly.com/uploads/1/3/4/5/134501511/papibilagokib.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/jdGhcgj/zutupogazelesame.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/1e75e29743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/58761084747.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/somumumupipadig.pdfIn PDF document text
    • http://litiwevapebani.epizy.com/suwizuvovosedeselexafotug.pdfIn PDF document text
    • http://wenavigabex.rf.gd/body_for_life_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/bullet_journal_ideas_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/the_lemon_orchard_title_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/kakituvorunuma.pdfIn PDF document text
    • http://zemigubu.epizy.com/40187426406.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5372 bytes
SHA-256: 2f6234ecd65dc26c1c7652ab2c040ff3e203dd3e387cc1d96610590ed49e3bea
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 11744 bytes
SHA-256: 10e5509b8b6b808fb0e288e9e2306b43a43c20e496ea5331bf2c4f000d483116
font_02_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 16076 bytes
SHA-256: efacb489886405533b596dc0e6c66705370259ca1b04a4f865fb41c1275705db