Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daf71b3121ecc66…

MALICIOUS

PDF

97.1 KB Created: 2021-03-11 17:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7520724f58519f091162da01899a7c6e SHA-1: 6b3e16058e1a81713e5266c5c8bd0ebd0aa0b1d3 SHA-256: 3daf71b3121ecc666801a8b697f5c8c510f63cd977f194b8c975f87635baf6fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm with numerous external URIs, including one pointing to 'resalured.ru'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used for SEO spam or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=tamil+hd+songs+old PDF link annotation
    • http://gunaborekigefu.22web.org/47804127798.pdfIn PDF document text
    • http://fefebigaxef.iblogger.org/tevanafeziladexegogebured.pdfIn PDF document text
    • http:///www.paadalvarigal.comIn PDF document text
    • http:////yolyrics.in.phpIn PDF document text
    • http:///\/www.paadalvarigal.com\/602\/poongathavey-thaazhthiravaai-nizhalgal-song-In PDF document text
    • http:///\/www.friendlysms.com\/tamil-lyrics\/sattam-en-kaiyil\/sorgam-madhuvilae-In PDF document text
    • http:///\/tamillyricsnet.blogspot.in\/2015\/02\/meen-kodi-theril-lyrics-karumbu-In PDF document text
    • http:///\/musiclounge.in\/podhuvaga-en-manasu-murattu-kaalai-In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/beaconhills_college_uniform_shop_trading_hours.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_a23b30e526a3431c986a20cb589980c6.pdf?index=trueIn PDF document text
    • http://pevoxetawalob.rf.gd/pilexuditonusuwuramevit.pdfIn PDF document text
    • http://zapulozamatuwe.epizy.com/calumet_county_gis_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6219d74b-37c5-463e-a95d-fb1274a98be3/57757524373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717bb1cf-2e94-4bd3-ace3-b2a8807608d6/did_colt_stop_making_the_le6920.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_b647cbd8dbea4aa2a6034e660fa3106c.pdf?index=trueIn PDF document text
    • http://fizuxobitunoge.epizy.com/2289180510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492a937f-420e-4535-a203-58c7d27d3391/zujejurupasejim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57161dc-eff2-4573-87e5-d45bf531a0c2/mabutesikabonow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f2a519-4d44-4c7e-beca-107ae890c750/sole_e35_elliptical_best_price.pdfIn PDF document text
    • http://rujipezoj.epizy.com/lightning_thief_movie_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0931f7ef-e6f1-4471-9822-91c114f4bf81/67875473057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2047d83-e8c1-4dc7-abee-7fc8e4e1fc31/lekodurizotegi.pdfIn PDF document text
    • http://fikamax.epizy.com/zewosupabawulom.pdfIn PDF document text
    • http://podaviloridi.rf.gd/school_of_rock_2003.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/zofezinuxuzikedalasitex.pdfIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_f8c93d8ddf5a40d1971b29efab20124f.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_2391bd9605904e6b857329daab9f398f.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_74b0296572d0444da7b29fa688cade99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/78791555125.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_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 5092 bytes
SHA-256: dc0bcfac5a3472df842495dc8fe7d85bb9dd2e6962b299d3f7a5609f4ba7c391
font_01_sfnt_off0001475f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475F 14856 bytes
SHA-256: fca165c734c9d4853b5334d486201fd811fd0cbcdb425df4b41db9edae4a0933

Open this report in the interactive analyzer, or submit your own file for analysis.