PDF malware analysis — malicious · 617cce047c66d797

MALICIOUS

PDF

79.7 KB Created: 2021-03-25 08:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 2b0342d1a27e0816486075b750a4f274 SHA-1: 97815eb081c4eaa4ca3c43af79837ba4e18735d7 SHA-256: 617cce047c66d797d2fd97ac9ebaacf9c466f008714f2807968fdeafa0524216

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, masquerading as a worksheet answer key to entice users to click. The PDF_SEO_LINK_FARM heuristic indicates a large number of links pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9967

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://golowaki.ru/wix?keyword=electron+configuration+and+orbital+filling+diagram+worksheet+answers PDF link annotation
- http://tivuximuliku.mygamesonline.org/47499901390.pdfIn PDF document text
- http://rbqjkwklnd.xyz/is_alice_really_dead_the_magiciansrkjg2.pdfIn PDF document text
- https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/neletejaputamigari.pdfIn PDF document text
- http://zibodotuf.mygamesonline.org/how_to_swing_trade_andrew_aziz.pdfIn PDF document text
- http://fasad-dom.site/yamaha_r6_maintenance_cost5gekq.pdfIn PDF document text
- http://sakaxek.mygamesonline.org/gefevokozebebefojikukuve.pdfIn PDF document text
- http://suwufexez.sportsontheweb.net/word_doc_to_converter_free_download_filehippo.pdfIn PDF document text
- http://bigtittybella.com/ligopevikutuvugujutubrufr.pdfIn PDF document text
- http://2220202.ru/how_to_tighten_chain_on_stihl_chainsaw_ms1708b1gp.pdfIn PDF document text
- http://getbuiss.online/ankh_bhari_bhari_song_freeoxfio.pdfIn PDF document text
- http://pililiriniru.mypressonline.com/solex_carburetor_working.pdfIn PDF document text
- https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/3649025.pdfIn PDF document text
- https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/ninevolamovet_febataruve_zojolu_bopewejosup.pdfIn PDF document text
- https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/rakuwojomavuja-fikatowesek.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/wamatasamegu/authors_craft_moves_definition.pdfIn PDF document text
- https://s3.amazonaws.com/ganubatebedoxez/about_us_powerpoint_template_free.pdfIn PDF document text
- https://s3.amazonaws.com/likerajatob/feduxopawolijikob.pdfIn PDF document text
- https://s3.amazonaws.com/xapijifas/96599959955.pdfIn PDF document text
- http://gozuketitara.onlinewebshop.net/how_much_is_a_2015_honda_accord_exl_worth.pdfIn PDF document text
- https://s3.amazonaws.com/xopugup/64301533505.pdfIn PDF document text
- http://ritumogadoj.onlinewebshop.net/barrett_s_esophagus_diet.pdfIn PDF document text
- http://zenakezogutomu.onlinewebshop.net/52436524031.pdfIn PDF document text
- https://s3.amazonaws.com/xasovewipeje/adam_lambert_ghost_town_mp4.pdfIn PDF document text
- https://s3.amazonaws.com/kigavanus/bopaxewurukogorutiro.pdfIn PDF document text
- https://s3.amazonaws.com/bawalidamovidud/tujuxodupofajo.pdfIn PDF document text
- https://s3.amazonaws.com/jiwisigetizoxif/37209254245.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f7b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7B3	5688 bytes
SHA-256: `b079a4a32097cdf6bafe60ba891e83fb6e732fdeea0eaa69c5555a74a540b0b6`
`font_01_sfnt_off00010aff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AFF	11020 bytes
SHA-256: `b4ab506699e91aa0b16c1f5dd6a7e721a47092045ab3ac36bbc4876dd0cb1d5e`

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