PDF malware analysis — malicious · c66b19214ffe3d29

MALICIOUS

PDF

109.7 KB Created: 2021-01-31 14:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: ff9a5c69eaf830d9d0d0090cdba47f53 SHA-1: 08b7feed39ebf567309f98987a430338ba96199e SHA-256: c66b19214ffe3d29be05980285520cdd71ebd124fc38030cd4cdc5abbbd48528

246 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically for brand-impersonation credential phishing. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirector infrastructure. The ML classifier output of 0.999758 strongly indicates malicious intent, likely related to credential harvesting via the impersonated UPS brand.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/962909610.pdf.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://traffnew.ru/wb?keyword=hoka%20rincon%20runrepeat PDF link annotation
- https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/962909610.pdfIn PDF document text
- https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/jijoba.pdfIn PDF document text
- https://selegisazo.weebly.com/uploads/1/3/5/3/135323244/jiginepinizupufuban.pdfIn PDF document text
- https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/4737741.pdfIn PDF document text
- https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/surebosiludite.pdfIn PDF document text
- https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/f3beaef.pdfIn PDF document text
- https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/gotaku.pdfIn PDF document text
- https://cdn.sqhk.co/fabukujeb/ctI7oha/block_craft_3d_mod_apk_2020.pdfIn PDF document text
- https://cdn.sqhk.co/dederubap/d2z7hfx/happy_planner_watercolor_rainbow.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/rizoli/b13_bluetooth_speaker_driver.pdfIn PDF document text
- http://momugegunimex.rf.gd/beyblade_game_for_gba_emulator.pdfIn PDF document text
- https://s3.amazonaws.com/sinadi/biopsy_report_of_uterus.pdfIn PDF document text
- http://roxewew.epizy.com/buddhist_chant_sheet_music.pdfIn PDF document text
- http://nuzavaxevarap.epizy.com/72335100237.pdfIn PDF document text
- http://vufagozujidivu.epizy.com/57162033129.pdfIn PDF document text
- https://s3.amazonaws.com/nevovumowa/sheet_glass_recycling_near_me.pdfIn PDF document text
- https://s3.amazonaws.com/dekogamik/metal_gear_rising_boss_guide.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_off00016534.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16534	4624 bytes
SHA-256: `6c421a09c143cc9c4621909cb3238c7c3ca157885dddbadf3423b512da682c96`
`font_01_sfnt_off000174f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x174F2	11328 bytes
SHA-256: `1911a2b0d8f365704db008b8294592bb013e12789db819c30004f148cc384dcf`
`font_02_sfnt_off00019b60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19B60	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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