Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2142f6e58f3759…

MALICIOUS

PDF

73.3 KB Created: 2021-04-19 18:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c67b2980e97bcb8e1edf0b63af29b2bb SHA-1: 857b4b88c3078bc6e23a43451a62af428ff053b1 SHA-256: 1b2142f6e58f375998d5deb8706650e2cd50decaa74a4dca470bad028150046f
186 Risk Score

Malware Insights

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

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 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://leonvi.ru/strik?utm_term=timex+alarm+clock+manual PDF link annotation
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/moxolobesamaf_danarabo_rusot_xerumidolo.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/7965713.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/dudotibazu_mebafejijizefe_latebomuneneg.pdfIn PDF document text
    • http://pikowomaxuden.iblogger.org/the_one_kiera_cass_free_download_english.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/2755741.pdfIn PDF document text
    • https://naxujurimarawe.weebly.com/uploads/1/3/4/6/134640244/4291300.pdfIn PDF document text
    • https://gabatilijoden.weebly.com/uploads/1/3/4/7/134730515/0238f7b1375e52.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/siviwatero.pdfIn PDF document text
    • http://parkji5x.xyz/ocean_eyes_sheet_music_pianozio0t.pdfIn PDF document text
    • http://bnatural.space/driver_booster_keys8abhs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_1ee01fcf0acc43a7aa100132cee9ab69.pdf?index=trueIn PDF document text
    • http://wokoziguroron.rf.gd/12916860398.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_9dfc6e0140db4a4bbdc68a9d64dc6bcd.pdf?index=trueIn PDF document text
    • http://wigifanike.epizy.com/48464434894.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/wasizivojusebosidabomemom.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_b17455232e1549d3a1ecdef25b3d331b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/11525441677.pdfIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_3fe3ad70be514f018f51bbfc9cd731c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/libros_sobre_habitos_alimenticios.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/53218978528.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 4848 bytes
SHA-256: e632d562e8b4a51db9c4386922aee90b8174ff7e017af30a892481bee15b35e3
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 11172 bytes
SHA-256: 024c223f1be18814bed289eb387a51f1c8381e5dbe1f62f03cad44eb665fc2a2

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