Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d7203726efc4b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 14:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0283f8cad10abd7d22e30cb6fb541a1 SHA-1: 22e524f0f8d0cc15a6128e95fa80e415a0e02baf SHA-256: b15d7203726efc4b0ea63901d594f91bd85ffcfa5c845fd1becf656a7ca4eb8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL 'https://ponafet.ru/123?utm_term=functional+analysis+worksheet+cbt' is likely the primary lure, while 'http://rovafitazilom.epizy.com/69296298579.pdf' is part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=functional+analysis+worksheet+cbt
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fe4f8aa87809.pdf
    • https://cdn-cms.f-static.net/uploads/4407795/normal_600f496573c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rovafitazilom.epizy.com/69296298579.pdf
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_abdee31f087848a484e7ab3810a87644.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d83509a3-c9ec-447f-b0e4-3416ce6a8933/beat_racer_mod_android_1.pdf
    • https://uploads.strikinglycdn.com/files/40936af3-dcef-43af-baa1-79791d193e02/50082220476.pdf
    • https://s3.amazonaws.com/sojebelevenex/bowflex_pr1000_resistance.pdf
    • https://uploads.strikinglycdn.com/files/60f192be-5ea8-427c-836a-061e622e758b/27479883155.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_0907b07943c24a238caf970ec4c44fda.pdf?index=true
    • http://batutadazuva.epizy.com/xovuwisusig.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/84740850751.pdf
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_8278ae7f8ac648d1ade2e5980220eb32.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/66075742566.pdf
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_68ea2d4892fb47c7a16bdee35e9b0261.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92b3b345-c8b3-42d5-a9cc-894e4fc7b86b/h2o_x5_steam_mop_-_pole_replacement_handle.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_aa42e367e1bc4648ae3a94894364945e.pdf?index=true
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_2785ade818524aee8f10864d798c702a.pdf?index=true
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_db57e1ed7f694162bf89ebb7db66e61e.pdf?index=true
    • https://s3.amazonaws.com/nerugiraxura/xipibowe.pdf
    • http://xilibosukotijob.epizy.com/java_spring_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/f37b0082-ec50-4277-bdba-bc77f3de2e47/92724723940.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin
b3f43afd6458cf0bff0321b3ecefda2d683125233698d29a061fc55ab5f4fd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5240 bytes
font_01_sfnt_off0001063c.bin
2ada85a78765f32c3c9bd931cdd28162d59a151dd7100fd53f6f0794c45e3143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 10736 bytes

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