Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e91cac8acb8d2e…

MALICIOUS

PDF

93.9 KB Created: 2021-02-25 12:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 860241b8338ddd1f211be099ea206413 SHA-1: 915ee78ca1abeb68e00feb7b1c1c1f325f560879 SHA-256: c8e91cac8acb8d2ee6f7cc655de4a177c331eea5761b9b0df572b0571413acf0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'https://maypoin.ru/123?utm_term=lct+208cc+engine+manual', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and the ML classifier output strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=lct+208cc+engine+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473638/normal_600b2cf40102c.pdfIn PDF document text
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/65785e14e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469386/normal_5ff9219852028.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/peveresikopavakile.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/ghVjcif/30879661645.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/gjjigjf/49606362801.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/majemibigat-garodakine-datesumiga-bisifafaboxe.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/tazakuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/cAtihjc/hero_xtreme_sports_2020.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/runogekuvap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_601a3366bb1f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poresi/tuweworeguragopujedewuniw.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/light_bulb_png_icon_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/bovibebufiguwaremu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/what_is_audience_in_creative_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/camera_apps_in_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/47979789718.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/feluvabumo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 5256 bytes
SHA-256: 2b0f1eec2d0cad729bab218137acf637fe40840f1008b9b5463b20c125f8fcba
font_01_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 12444 bytes
SHA-256: ee656d877374cb8b50d6fe17c5dab5efa84e4686653418de42151f23ee931a95
font_02_sfnt_off00015552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15552 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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