Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78808219cfb626a…

MALICIOUS

PDF

65.1 KB Created: 2021-06-05 05:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16feb6d13defa2409c428707c08c271f SHA-1: 40e7fb80e0c5413e754f19ec032faa7ff85b76e2 SHA-256: e78808219cfb626a947664120c11fc63792593b7e232523334fdc700c90bda0a
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 0.9998

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://infrive.ru/pbw?utm_term=is+there+a+4th+journal+in+gravity+falls PDF link annotation
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/6634938.pdfIn PDF document text
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/garoz_pigamomubu_julopejor_jonatu.pdfIn PDF document text
    • https://gujukajiw.weebly.com/uploads/1/3/1/4/131437807/birumev-piwejoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_60b982710c357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_603fc688b475c.pdfIn PDF document text
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/samuta-dibamexose-xaxowoxonulapuz-valuk.pdfIn PDF document text
    • https://xofadasuvakijo.weebly.com/uploads/1/3/4/5/134587438/9071495.pdfIn PDF document text
    • https://kokemigigumuv.weebly.com/uploads/1/3/4/0/134042371/2223263.pdfIn PDF document text
    • https://pinecast.com/lisIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a2ed1a-4f68-423f-b2b9-ae567d3842c6/play_opera_madama_butterfly_live_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f58285-1720-46a1-9ed8-beab49b82abe/rilafuxurofoxajemolenas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0de8925-8eaa-4bf9-adac-b12987f3f404/65883213387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9ef03d-1382-45a4-97db-53671d7a8d99/how_to_charge_a_camcorder_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132e2ee3-5dcc-47fd-a761-36c69ddbbc14/how_to_fix_genie_garage_door_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baf5a7a-b609-4046-b732-30de037e6785/how_to_paint_scale_model_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619afb2a-f2d7-4093-a4c1-fdf2f38adea9/vojafegesanutozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e9641b-72b7-4c68-b6fa-c0f0a38bce56/what_is_the_most_powerful_battery_operated_leaf_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425d3f86-19cd-45eb-ac85-aa7900c18cee/alla_prima_art_technique.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_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 5292 bytes
SHA-256: 72fa36b6de8a6550600e1d9f9887940fb10e25d86541bb2c100db688a6a93797
font_01_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 9672 bytes
SHA-256: eeef370e2397ed2321a28f96728f7e5621aa473ff3716f4158fd288edb331e60