Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb71377b9fc052…

MALICIOUS

PDF

84.1 KB Created: 2021-02-14 13:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f869759916f32dd3b0e20c123df588e5 SHA-1: 85923edfcdd5d504bab79393a7a1cdf491ccb855 SHA-256: aacb71377b9fc052f385f9f4acc3e605dc1bdb47d0fc507881d23999c4ac86b2
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or phishing operation. The primary external URL, 'https://jacksth.ru/123?utm_term=can+bearded+dragons+eat+apples', appears to be an SEO redirector used in phishing lures. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=can+bearded+dragons+eat+apples PDF link annotation
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/c3fabb.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/aspen_enteral_and_parenteral_nutrition_guidelines.pdfIn PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/rujidalezozuki-larul-savugebukuj.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/109fc.pdfIn PDF document text
    • https://vuzitiruf.weebly.com/uploads/1/3/2/8/132814505/f3d079a3.pdfIn PDF document text
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/28e61.pdfIn PDF document text
    • http://jugezew.22web.org/80773339184.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/tisovuwabijezupirom.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://s3.amazonaws.com/niwotipugonuvoz/zilorevu.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/sarotamu.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/kdigo_guidelines_transplant_recipient.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/prime_factorization_tree_worksheet.pdfIn PDF document text
    • http://bibijovefuvak.epizy.com/sugar_fermentation_by_yeast_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/textview_first_letter_capital_android.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/abrsm_grade_1_theory_past_papers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 5028 bytes
SHA-256: 53711f72e7971af6ead1b5273e8b5c73ef3f32f69ada01e991573dd92996808d
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 10372 bytes
SHA-256: 288d02f549399dec5c61a47e71137eea60f160e1aa83a1f2e180eb409778890e
font_02_sfnt_off00013565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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