Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a04a86d373c52e…

MALICIOUS

PDF

73.1 KB Created: 2021-05-22 16:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55d2d71af8a4416212b2991515422b69 SHA-1: dff10cef6513f6aeb9fb80ed23240255bd1a5705 SHA-256: 88a04a86d373c52e89bdcc02e9607a511f08599b8010b5bc2b331b0d04e28ec2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to a redirector URL. This suggests a phishing or malware distribution attempt, likely using a lure document. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=liturgy+of+the+hours+guide+2021+large+print PDF link annotation
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/diwonofevox.pdfIn PDF document text
    • https://naxuvate.weebly.com/uploads/1/3/5/9/135960989/gipebibasogo-rakuvamu-nuxire-rerogigiga.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/bofikowubiselox.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/gexofotilan-domiwatep-juvatuwuletozog-wariver.pdfIn PDF document text
    • https://jajozopikikaju.weebly.com/uploads/1/3/4/3/134359408/438a6a9c64c3d3.pdfIn PDF document text
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/keloxasisadap_jubexejupom_laxevajizaxeb_danipulinizafam.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/jelosamiromezokapar.pdfIn PDF document text
    • https://solemadu.weebly.com/uploads/1/3/4/4/134486709/8338913.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/877067.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/xifilebojunavu-jogusedamip-nesururolajajat-milidujakogikik.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/88c20.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/kigegovisi.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/1088292.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/rogido_fobirifawosaku_gujexetelo_titusodisil.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/gasedenanedabe.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/7944588.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/vedexajawo/masked_singer_australia_prawn_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/troy_bilt_weed_eater_tb32ec_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/glencoe_science_biology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/dewalt_dw718_chop_saw.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 5672 bytes
SHA-256: 9dc43da2145e9ebf9274b84dd765bb2d1ddb87f3feb1710a97b3fdf4ed59a144
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 11260 bytes
SHA-256: 1d6657faba1e1104bbd7d8ee54c856bde33a8121628122020f93604119934f7b