Malicious PDF — malware analysis report

Static analysis result for SHA-256 3485331570464f3e…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 21:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 125a1d9d7685cb8808e72bfeeca395a4 SHA-1: 9d345fd8c5814f2b0c90d32e4f3931620ef777c8 SHA-256: 3485331570464f3e1f01e465997551ee221a2beec989c1e3453abc45447b8231
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary lure appears to be a search result for 'how much does it cost to get certified in medical coding'. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+much+does+it+cost+to+get+certified+in+medical+coding PDF link annotation
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/6140347.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/rumafutugukavuji.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/1099331.pdfIn PDF document text
    • http://katermore.ru/tarascon_hospital_medicine_pocketbookqyhxq.pdfIn PDF document text
    • http://presentinsta.site/stephen_king_movies_best_horrortgy49.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/karumod-zozujedo-rusemowaja-gunav.pdfIn PDF document text
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/wizemugezekom.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/lefezajogav.pdfIn PDF document text
    • http://letinebab.mywebcommunity.org/js_decode_base64.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/7bd93f23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_bd7cb5b9810b4adb81ca7177dd3c11be.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_0026a2312f8848deb1b43d3e0a1d94b9.pdf?index=trueIn PDF document text
    • http://gamelaluwer.myartsonline.com/65299511031.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/87149034085.pdfIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_266e8bf7f8604db7819ade39948ca5f0.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_f217b0191fe4418e92394b2cbf8a34ae.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_0043101b90c7458bb0417f37104420c3.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_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 5488 bytes
SHA-256: a69c4c81b523d1fd451964820ba7a750db0a46f6392ee6f76ef2b122a2b19460
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 11048 bytes
SHA-256: 0c12a4ce1f8614c6fdd7a5d587f0dc842283a2d96d4effebd9f676932d37a6b8

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