PDF malware analysis — malicious · 1fc2ad347a8bc6f2

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6fa63093e5219e0490c2aa2dfc49f7b3 SHA-1: 1ca40f42d2eda69f8e8bb1e6eca7e526405f4214 SHA-256: 1fc2ad347a8bc6f27753d3cc1fb14a69ac4aadb96e6e924e4053a579a47abe73

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malicious content distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://cructi.ru/uplcv?utm_term=hex+base+16 PDF link annotation
- https://sts-cct.com/app/webroot/userfiles/files/wodazujuzusadubobu.pdfIn PDF document text
- http://lavalnerina.it/userfiles/file/mewerejafelazefi.pdfIn PDF document text
- http://lrm.mcdonalds.ua/ckfinder/userfiles/files/61275511555.pdfIn PDF document text
- http://xn--b1akwe.xn--p1ai/userfiles/file/12669589613.pdfIn PDF document text
- http://erago.cidees.com/uploads/files/32810895185.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e690a293e074e05f6457effcf4b07b89/79599026688.pdfIn PDF document text
- https://durimawar.com/contents/files/53176617197.pdfIn PDF document text
- https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109040758084384.pdfIn PDF document text
- https://consultemergingmarkets.cubsindia.com/files/95345046646.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/74949379312.pdfIn PDF document text
- http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdfIn PDF document text
- http://nujhimachal.in/img/uploads/files/pivemipalapolaladapeta.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138598b27803---madawavukesimarakapube.pdfIn PDF document text
- https://bedandbreakfastholten.nl/userfiles/file/43415709504.pdfIn PDF document text
- http://rockhouseschool.com/rockhouse/uploads/files/falijuvazuwogune.pdfIn PDF document text
- http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
- http://ambulatorioveterinariovianello.eu/userfiles/files/20037850127.pdfIn PDF document text
- https://profitaler.com/UserFiles/file/visikejalutevonowizanuwi.pdfIn PDF document text
- http://fotosvatba.net/userfiles/file/48810077050.pdfIn PDF document text
- https://edinburghpools.com/contents/files/50275752757.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB5	19012 bytes
SHA-256: `2e37917d7287c43e0784f60dd9ab503ed9022d47abee317c4f24d3bf9f5b2835`
`font_02_sfnt_off00012189.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12189	9996 bytes
SHA-256: `f88abbabe009b64d7cedd52bf6abd7f50264ec9e6f8ab5760b7c34839d8833b7`

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