Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c5f2e83ab504a…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 16:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 12fd9c40e852f743f52a971381261713 SHA-1: 450dce519bb2ef81c47e481da8fbe8d4572f461f SHA-256: 388c5f2e83ab504a5c2c0e77683c3f9170c23b810fc43d7eced57465ba6c6697
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further supports its malicious nature. The primary function appears to be directing users to a network of linked PDFs, likely for SEO spam or to distribute further malware.

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/wix?keyword=charmlee+wilderness+park PDF link annotation
    • http://xofelivigavas.mywebcommunity.org/ligonofasojukuri.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/hhE1Hjd/terel.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/b192526dfa94fa.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/jhniigg/history_s_greatest_mysteries_history_channel_schedule.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/4680d93e9f.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/juforabukigi.pdfIn PDF document text
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/44d347.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/ae1b390c2.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/dPU0idD/indoor_hockey_training_facility.pdfIn PDF document text
    • https://tivowigelatel.weebly.com/uploads/1/3/4/4/134495783/kurinapomelujodevit.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/fadasibi.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/pizajomod_suwadegup.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/fosamodomik-lofozonen-tutedelin-xiliwebagox.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/boviligagu_wofonu_ratug.pdfIn PDF document text
    • https://cdn.sqhk.co/roturoda/jhifhff/18913730834.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/fUgYSPd/out_there_chronicles_episode_2_walkthrough.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polabufu.myartsonline.com/two_column_cash_book.pdfIn PDF document text
    • http://minirulo.epizy.com/platform_bed_frame_wood_queen.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_4d7bed0d57664c20b31847f2a5230edb.pdf?index=trueIn PDF document text
    • https://7648721b-06f4-4917-9c2a-921156fbbd07.filesusr.com/ugd/a7266c_b5de1e9c6d5a4d6bb127792ace826059.pdf?index=trueIn PDF document text
    • http://fipomazuwasa.epizy.com/barking_and_dagenham_college_application_form_2018.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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 5260 bytes
SHA-256: 2c44f1db4e18edf8b133c814d3e1ab26d165d7dca45aa2cdd9961f98ff10acd0
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 10852 bytes
SHA-256: 33a382865da2311627e1a20550e053bcc12e5fca87724fef3f8ef64349bfd18d