Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccedae9187759ae…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 13:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb3065b727bbe0b28970adb0a837ca5 SHA-1: 2a2ec274632b6d1dafa304543e2f8bc911db5a2b SHA-256: 9ccedae9187759aeca31aa159bd92ca62acfd3cd494e9122a31092822841918c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-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://soxebez.ru/award?keyword=odisha+aso+exam+books+pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/lixowowet.pdf
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/jolubovira.pdf
    • http://reveruverof.medianewsonline.com/maritime_law_enforcement_manual.pdf
    • https://cdn.sqhk.co/zanudiwageg/bLgge9o/inspirational_story_about_dealing_with_changes_social.pdf
    • https://cdn.sqhk.co/vatukaso/1Djggen/carx_drift_racing_car_tune.pdf
    • https://cdn.sqhk.co/zogowefu/2LjdCji/14269595311.pdf
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/3712237.pdf
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/8819b7b8f9a.pdf
    • https://cdn.sqhk.co/fofateze/giiihjj/labepajipavas.pdf
    • https://cdn.sqhk.co/dadakafopina/jghhhig/age_of_clash_of_clans.pdf
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/0365ba8f4fa5.pdf
    • http://zoguponuwuxoli.medianewsonline.com/ludisaxolif.pdf
    • http://lajodibibodi.getenjoyment.net/bojakigifo.pdf
    • http://memisada.mygamesonline.org/jawazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_6f7071e1efe54c7fabc6782429ccb08c.pdf?index=true
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_a555b4aa0e564a6bb6b2c2b990830b37.pdf?index=true
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_19cacc9f87fd4a0db657adb132fef762.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_33225864c9c046989bc9cee4cde40819.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_b8b450ba6db640ecb5465203ce26139d.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_9957ed8628644b52a353bc746a2cfc40.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_b2320e42afda46efa9c4adcb2f4e73ed.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_158e65ef9f5d4dd992d5ba4fe49feaf4.pdf?index=true
    • http://sogivuwe.onlinewebshop.net/patamifokemovotidudeseba.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_off0000de55.bin
55c5e1509f0fceae8216cde5f974c71ecd88583e4b7e38e297780fbcadf60e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 5452 bytes
font_01_sfnt_off0000f0b9.bin
1a25b05e723da0a939672dc30dc1b88861e74fdc80c370f3b7449527a46db336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 10836 bytes

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