PDF malware analysis — malicious · cc8a357d1a1d4d65

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 5a80b2f39291d8db7db9796acb2425cf SHA-1: b4aa9a61c59a3c30937978980a75e4826699dc45 SHA-256: cc8a357d1a1d4d65b3899d57b38e2c3f40af59af4e720a7555bed05fb9768575

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

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 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://xajibur.ru/award?keyword=functional+programming+in+scala+manning+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4370087/normal_5fc5ea7133de9.pdfIn PDF document text
- http://suniduno.iblogger.org/63382676920.pdfIn PDF document text
- https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/c00bded5b2f70bb.pdfIn PDF document text
- http://rezotu.xyz/char_broil_gas_grill_parts_home_depotwl914.pdfIn PDF document text
- https://wigazivebale.weebly.com/uploads/1/3/2/6/132695242/nitaneloluji-mowuwirox-mujuj.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485152/normal_5fe6dbb30ea9b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387035/normal_601b60272719d.pdfIn PDF document text
- http://dokumenty-kiev.online/burnham_x204_boiler_reviews2ahsf.pdfIn PDF document text
- http://proba7.xyz/let_teenager_try_adulthood_rhetorical_analysisll3j4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384482/normal_5ff8b97e23b1d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375705/normal_6055f0b01d8e1.pdfIn PDF document text
- http://zdorovie-vashe-vse.xyz/zagekalesuleguxizaps6.pdfIn PDF document text
- https://rusuxizebagujam.weebly.com/uploads/1/3/5/3/135302265/336baf29af9531.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
- http://zokekoja.rf.gd/44854179462.pdfIn PDF document text
- http://gujabusenetawun.epizy.com/wanepunokulewu.pdfIn PDF document text
- https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2449afe63e2a4f57864c6bd86d783728.pdf?index=trueIn PDF document text
- http://nepopenezum.rf.gd/dukes_anesthesia_secrets.pdfIn PDF document text
- https://s3.amazonaws.com/jazamerijekufol/wajiwujozat.pdfIn PDF document text
- http://pixiwusiluziror.epizy.com/fufodotitepireri.pdfIn PDF document text
- https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_aaa8a1d1c30f4af5a72f0146a4f61ed0.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/taguxif/cules_son_las_enzimas_hepaticas_y_sus_valores_normales.pdfIn PDF document text
- https://s3.amazonaws.com/gagagakigibapo/how_do_you_reset_the_icemaker_on_a_whirlpool_refrigerator.pdfIn PDF document text
- https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_4a884e3753ed4483942acfd5759296e1.pdf?index=trueIn 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_off0000ebf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF1	5196 bytes
SHA-256: `10a9d63d890630b852926bec2b9f06f88337abd51810fd9593934af74d3becda`
`font_01_sfnt_off0000fd72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD72	10948 bytes
SHA-256: `a8f0a41d3bf998794ad31acf0661dad4bf49f55db7b055bc0c57e9ba0af55379`
`font_02_sfnt_off000122b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122B0	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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