PDF malware analysis — malicious · a6e72d2430711dfa

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 22:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 05d0fe3059af376c1447ccd9fc04b4f7 SHA-1: 485b5ef346233e0edae02b37534dda74b4225470 SHA-256: a6e72d2430711dfadc1771bc4efff415383cc020038c1cc83728416a5e2fbdcd

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the link farm behavior is a common tactic for SEO poisoning or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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.
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://crophysi.ru/wix?keyword=telluride+2020+lineup In PDF document text
- https://cdn-cms.f-static.net/uploads/4420592/normal_601ab67e9c854.pdfIn PDF document text
- https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/belurorigimit-jebolo-pelebukovelos.pdfIn PDF document text
- https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/nivul_fitutexabepaviw.pdfIn PDF document text
- https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/866365074548e6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366008/normal_5fdacb7c3081d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445881/normal_5fdb8161ec3b3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449014/normal_600a4ce64fffd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450896/normal_5febcd963e8c6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393508/normal_5ffffa1771bb9.pdfIn PDF document text
- https://cdn.sqhk.co/letopoto/Ijfic4j/vevupazezuk.pdfIn PDF document text
- https://cdn.sqhk.co/wavefekus/gdkjgT1/transfer_sim_card_to_new_phone_sprint.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366036/normal_5fdb8af1c9bf1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393514/normal_5fe7215fef07e.pdfIn PDF document text
- https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/8388687.pdfIn PDF document text
- https://cdn.sqhk.co/nububufi/gjiggih/misadatinoliler.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/jinotugiwomo/bitdefender_control_center.pdfIn PDF document text
- https://s3.amazonaws.com/tidigudetefumof/addition_worksheet_for_class_2.pdfIn PDF document text
- https://s3.amazonaws.com/lixuduwonifa/duvet_cover_sheet_definition.pdfIn PDF document text
- https://s3.amazonaws.com/vuzotisenixava/chocolate_2005_movie_free.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_off0000edd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD4	4788 bytes
SHA-256: `9527d10f590685fc0de743f97706ae5645ce152569209545f1fc27d25bed5b94`
`font_01_sfnt_off0000fe2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE2B	10324 bytes
SHA-256: `7cbdaf2ed935b30cddb5d869583a09ef8b50854ddbfc6df2a9d0702eefdaf08c`

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