PDF malware analysis — malicious · ff97d377a12409ac

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 01:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 1c3b5d6bd0166d02d748ec1c12c85666 SHA-1: 11fa96cd949d14c300892a2c626f4196e85a2b8d SHA-256: ff97d377a12409ace003aea00087d4f4848c73d7efebb7fb80be00a3bce4b8d0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to host malicious content or redirect users to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with common phishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

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 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://pelibifir.ru/wix?keyword=9.4+compositions+of+transformations+worksheet+answers PDF link annotation
- https://static.s123-cdn-static.com/uploads/4472484/normal_5fca8cf0d4344.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379230/normal_603586172893f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485305/normal_5fff52b9b8930.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369142/normal_5fd6c2acc1d3f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380531/normal_6034ddcf8a43d.pdfIn PDF document text
- https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/698710.pdfIn PDF document text
- https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/kopidawivevaga_nagirapo_janewipadi_najikovudanufa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451018/normal_602305765149f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466143/normal_5fd0aa3cc7488.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413982/normal_5ff85dc4c6e92.pdfIn PDF document text
- http://jasazotinalol.mygamesonline.org/46115441103.pdfIn PDF document text
- http://xokezuwadem.mygamesonline.org/monomaburonodolixofiro.pdfIn PDF document text
- https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/8808216.pdfIn PDF document text
- http://najetaxu.mygamesonline.org/case_studies_in_nursing_ethics.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4461748/normal_602af55f3c138.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/cc410b2d-3c41-4e24-8283-0ed457db2699/can_i_use_roku_to_stream_xfinity.pdfIn PDF document text
- http://jafixomedimun.onlinewebshop.net/dewalt_dw745_table_saw_dust_bag.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1e9e8f7d-6191-48f0-abc8-3eabc05c3377/jofexis.pdfIn PDF document text
- https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_b08deed87e92409b99f318a5af017731.pdf?index=trueIn PDF document text
- http://dijuvunote.onlinewebshop.net/79183435226.pdfIn PDF document text
- https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_9e93e05a06ca4d02b05ac465362085d7.pdf?index=trueIn PDF document text
- https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_be03c3e10e114885b8e307597c050973.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/4a0165ee-b9ac-4e47-a585-8a96ae6e9996/39464402654.pdfIn PDF document text
- https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_434227e3a6f54691bebef9e0f30283cb.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE86	5560 bytes
SHA-256: `bf51bf374e0f62696302ab46a3f1336f02f598969c2a4dd38a505da303803291`
`font_01_sfnt_off00010167.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10167	11500 bytes
SHA-256: `85c1a8d07e2e598590c4fb0123fa1707d66d7199d9f43e29b42f1ca9c0c48074`

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