Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6223dae46a7178…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 13:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7cd9d0e5134cf1ee663cac26e0b9d344 SHA-1: d73c6a1c55e7d2ae2442dc924264c285008f1a5f SHA-256: 9f6223dae46a7178413dc96f504177e2583e9908aa47a403189415ebd9fcb646
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a malicious SEO link farm, embedding numerous external links designed to redirect users. The primary lure appears to be a "manual" for a Holman qcs conveyor toaster, directing users to suspicious URLs like https://kuzutuzo.ru/wix?keyword=holman+qcs+conveyor+toaster+manual and http://stat-index-co.com/86803997673syfzk.pdf. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://kuzutuzo.ru/wix?keyword=holman+qcs+conveyor+toaster+manual PDF link annotation
    • http://stat-index-co.com/86803997673syfzk.pdfIn PDF document text
    • http://fallofelin.online/kikegerlt8yy.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/862cb498.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/mugapadovonepovefar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_602ecebbee6e0.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/026c9.pdfIn PDF document text
    • http://20970907.net/51998181487yfl4o.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/3097339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5fe8911d99fb7.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://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_e4afc9ec719e44ed8fdc36bdb537ee64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/35009140552.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/ansi_code.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/tegefadozinakovizeke.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/certificate_template_word_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/difference_between_layer_4_and_layer_7_firewall.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/lesifidavutisire.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_1e9b3a4fc8dc42139949000e2870cb3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/which_coffee_machine_to_buy_for_home.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5028 bytes
SHA-256: b1526501c1a47c04277023b01f88f205f6e5625ff7ca56fbcc7b33a8c6077ed0
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 11360 bytes
SHA-256: 23bc7d9a66333165c9240fd40af471a7d9541f63e10026658dab581facee8ac3
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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