Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6a1fe33a6d92d3…

MALICIOUS

PDF

82.3 KB Created: 2021-03-25 05:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b52d35d872b2d7145656cc948c51950 SHA-1: ea5deb5c8f0123ee1e8fbac9298b0295b0c7b2cd SHA-256: de6a1fe33a6d92d35afec23ce4fb1f3947612dbcdd3e8067f7b3c6f94a53a424
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 0.9990

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://xezojetit.ru/123?utm_term=facebook+app+free++for+android PDF link annotation
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/moparilidi.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/fOwhaqy/1000w_fm_radio_station_transmitter.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/mabigevugekedojatazegufuv.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/317525.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/jawel.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/kirubanimon.pdfIn PDF document text
    • https://nivunosanogerog.weebly.com/uploads/1/3/4/5/134516177/sikog_keravudawejudiv.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/c79c5443.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/55647159739.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/532738.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/waxop-nofazofatubibal-jafud.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/xirazovixugorutor.pdfIn PDF document text
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/nezorowugeki.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/UjfJ6ib/91427683330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/eae2a72d-2aee-413b-ad66-0dd1583cd4b7/4483968060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa23358-f470-4e94-869f-c770a6eae948/zinoz.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/nevakipapakopubiraxetora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c96863-0487-40c1-9520-275437ee30e9/vabarekamenofibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58623f23-1b3b-4a12-bbfe-5390c94e84f5/64234989049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf022795-df49-48e0-a32f-7991ed929535/remamodapiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45098a8-a1ff-4008-b5a8-f14af747b855/how_does_the_tasmanian_tiger_protect_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cb5c06-45d5-48a2-9783-2a574be8be32/16920918699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8f376a-7a72-4ea3-8b19-abc7bb78ff3b/87783866644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb50dd0-339c-486c-b0af-c01b194f5085/final_fantasy_7_official_strategy_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 4804 bytes
SHA-256: 1a514ad29859368190d9926c36b87b2c16e42b6db945cdbddbcf7390043bcf03
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 10868 bytes
SHA-256: a29a335a20acdaec0c9a24cb410f600266b6b281ed47382747077c2dccd8ab03
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2