Malicious PDF — malware analysis report

Static analysis result for SHA-256 55aab0f356dca00b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-25 00:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d9da3123e0f57267668634d030a30d73 SHA-1: 5ebecbfef645b792409a93c64360c2223a4cf8dd SHA-256: 55aab0f356dca00b0e69517a6842cee3473ace17a78d86e80d3ef07d1222f348
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It embeds numerous URLs, with a primary one pointing to 'midufefew.ru', likely serving as a lure for a phishing or malware download. The document body, though heavily obfuscated, suggests a pretext related to a technical issue with a 'rowenta iron'. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=my+rowenta+iron+keeps+shutting+off PDF link annotation
    • http://hotsales-com.xyz/25422201468wa9of.pdfIn PDF document text
    • http://milanomoda.site/25895877798sxe88.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/786300cdc.pdfIn PDF document text
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/bimuzutitus.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/85196856433.pdfIn PDF document text
    • http://zebinoleruf.iblogger.org/rasarube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5ff1e5765f7ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_604208edd01a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_600d10268446f.pdfIn PDF document text
    • http://puzirebidut.iblogger.org/agenesia_del_sacro.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/zolanavijokof_neluvojela_fefawisunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_600576268a541.pdfIn PDF document text
    • http://nashremont.site/runinarixajifosikofagepev49b2n.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/9c1f64b1-ba51-47ac-88b3-3c51fb33b8c4/32816356625.pdfIn PDF document text
    • http://bokizimumizom.epizy.com/biology_syllabus.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/65601472944.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/pinonumokanis.pdfIn PDF document text
    • http://sejekaxupoze.epizy.com/4028711627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29915e7-bf79-42b4-a2a0-548bd7671257/dir-615_c1_dd-wrt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808725bc-4b59-453f-b540-c33d210e7544/pl_sql_developer_jobs_in_canada.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5396 bytes
SHA-256: 95ff0ee5b3fb32f1460170bb01e6f5e301542ee7fbf0f4d53654e67b002c6263
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10724 bytes
SHA-256: 3381950614e4186a385ed99fbb67b64b265cd7b406627dc4aa0da888b675c8e6

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