PDF malware analysis — malicious · 490ddffa61b7a5f3

MALICIOUS

PDF

79.5 KB Created: 2021-04-14 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: aaaff1aa3264135df29524f17534fc6b SHA-1: dada6fda64ad997abad958b6e6f1513a1766756f SHA-256: 490ddffa61b7a5f36c645ffeb61a33d7d5c985c153edc47c5fcc821a02ad272c

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. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites. The primary redirector URL is "https://gimoguvi.ru/strik?utm_term=how+to+calculate+poisson+probability+distribution", suggesting a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 6

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.
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://gimoguvi.ru/strik?utm_term=how+to+calculate+poisson+probability+distribution PDF link annotation
- http://lighterusb24.site/waltham_31_day_chime_wall_clock_questionsqeuas.pdfIn PDF document text
- http://menbp.online/bully_android_apk_obb_modwwver.pdfIn PDF document text
- https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/5389373.pdfIn PDF document text
- https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/3216621.pdfIn PDF document text
- https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/5d219e50e288.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369486/normal_5fe213ece1a68.pdfIn PDF document text
- https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/9864246.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417309/normal_606c180f43385.pdfIn PDF document text
- http://superheatbelt.xyz/mabadetefejorodanuzisovb2ouy.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453732/normal_60110508d72bd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4371265/normal_600fa6947bd2d.pdfIn PDF document text
- http://trokot-roznica.xyz/baby_shark_1_hour_songs27w8e.pdfIn PDF document text
- https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/vokexopuxobaxaxodib.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/vuzotisenixava/creative_labs_sound_blaster_x-fi_surround_5.1_pro_driver.pdfIn PDF document text
- https://s3.amazonaws.com/fezenur/xifunovubugofewopimigoti.pdfIn PDF document text
- https://s3.amazonaws.com/rerinago/amma_images_hd_wallpapers.pdfIn PDF document text
- https://s3.amazonaws.com/baposivarabuj/calvin_harris_summer_songs.pdfIn PDF document text
- https://s3.amazonaws.com/juwofuxufijup/84855624292.pdfIn PDF document text
- https://s3.amazonaws.com/safago/vamuraduxodotonofopepisu.pdfIn PDF document text
- https://s3.amazonaws.com/zebarufuridorur/fapajilibu.pdfIn PDF document text
- https://s3.amazonaws.com/nuvukivaxiren/dagukofudewemurowelejuso.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e73c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE73C	5244 bytes
SHA-256: `99f5cab5800dbe1bcca33071c2bf29ae285acc132e740a67a270dc8b9da5a409`
`font_01_sfnt_off0000f920.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF920	11928 bytes
SHA-256: `a3d6fd1a81b5609c07cfb7ca5713f82d5cb3d48ac0285fee9d53247a6c24938d`
`font_02_sfnt_off00012202.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12202	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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