Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10755f2feddd7ae…

MALICIOUS

PDF

89.6 KB Created: 2021-03-08 04:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673cc4f3fe67568df078b6a553dc6b28 SHA-1: 74b13bb213e84eed9799ea8b38d4a5729bd36dbd SHA-256: c10755f2feddd7ae6a3aa2be78d86455364772d56a89cad1c2c6b0bd131387a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to phishing or malware distribution sites. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM strongly suggest a phishing or scam attempt, likely using spearphishing as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/aws?utm_term=project+management+professional+certification+pmi
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fowapapitebugeg-kisone.pdf
    • https://cdn.sqhk.co/nebemina/JIwjf7B/bitipoxazalozelijazip.pdf
    • https://cdn.sqhk.co/nisugavu/VYjhhfB/lucky_gold_have_a_lucky_day.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/mefesogegezop_kufelovu_bebiva_zesidinajo.pdf
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/12b08d470f76.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/3651750.pdf
    • https://nuxogisufebodad.weebly.com/uploads/1/3/5/9/135965827/a92e851346103b5.pdf
    • https://cdn.sqhk.co/dazulegug/Tqhfjgc/80862756124.pdf
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/jobuwaneror-notadamomapo-kigiwetafikut-wujog.pdf
    • https://kuredebe.weebly.com/uploads/1/3/0/7/130740483/d3a5fa3ce2eb3e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_c9e77d67293b456db56d1d4935572eb0.pdf?index=true
    • https://s3.amazonaws.com/bepukuba/73702727416.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_c039521621d24c42bbad763d27c06ead.pdf?index=true
    • https://s3.amazonaws.com/fefurorobumi/62698953466.pdf
    • https://uploads.strikinglycdn.com/files/fcd8f2da-993b-4c86-b451-af5442199954/76485725337.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_bce1412f3fc64ec88f20da2c33b7b974.pdf?index=true
    • https://s3.amazonaws.com/firudegix/bolens_13am762f765_deck_belt_diagram.pdf
    • https://uploads.strikinglycdn.com/files/00fcbd5b-1f55-47d8-b5e5-ae734d76b115/what_is_the_fuel_mileage_of_a_prevost_motorhome.pdf
    • https://uploads.strikinglycdn.com/files/2d0eae04-6225-4922-9b15-b2df6d74e4e1/wulamewidamizova.pdf
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_08922416a0b645e89fe3f088c9b8f63b.pdf?index=true
    • 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_off00011eeb.bin
83546cb3a1bf03993b54df141bd5d76cda78856b7dcaadfc3251968e5c846255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 5412 bytes
font_01_sfnt_off00013142.bin
5a9294f46d647e42d05d986a264a0fe889718808c6c51b22138920816cd2bb87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 11496 bytes

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