Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a58236f0c9f438…

MALICIOUS

PDF

92.1 KB Created: 2021-03-15 19:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5876abb7079cc7052fd2ef6473000fca SHA-1: 1755697e0533361f3ffd390719b4a31eddcc1888 SHA-256: b3a58236f0c9f43865df5b44ad3c60cd9b032e380cfc5458fb1c17fbc9ddcf32
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/wix?keyword=maiko+persona+3+social+link PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527345/normal_604473bdb954f.pdfIn PDF document text
    • http://ziweninuxepip.iblogger.org/professional_resume_template_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_6000acab15604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_604b37c17b948.pdfIn PDF document text
    • http://marafonsport.site/lord_of_clans_android_4._4._2gghbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_600d36278680b.pdfIn PDF document text
    • http://nutristrike-shop.ru/agricultural_vehicle_exemption_formrioc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_6010a21c44334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gukujuwona.epizy.com/scary_stories_to_tell_in_the_dark_trailer_2019_deutsch_film.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_1afe3520bdd1400d97e3a2ac78ac0aef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5222b8-47f8-4171-b2de-58641c195aff/18643999727.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_b23a164332d541efbfd9c1ece6db60dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7748ff45-05fe-47e2-ba8d-f2e5767826cb/62597530177.pdfIn PDF document text
    • http://kanufes.rf.gd/55678474350.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_6e1c67643a244d48b2df9490b269087d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a0a719-1b35-4a8d-adf5-57215a6ab442/dugebuxidarapema.pdfIn PDF document text
    • http://gidepajujida.rf.gd/32139574956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 4868 bytes
SHA-256: c3af6be3e95ecdaded0dee998fea1ded47a519484585053e343d407930a292b8
font_01_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 11776 bytes
SHA-256: 9d8dd7c7dac6759ade8a378d210dc5da2be536de33cbf144d38f49f9c861a38c
font_02_sfnt_off0001555a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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