PDF malware analysis — malicious · 4ec93c38d5362d61

MALICIOUS

PDF

80.7 KB Created: 2021-05-24 09:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 107c1acb485a739a40b9149aa8f89287 SHA-1: be7a4c2122f3bc7a1dd851392459827f692f06f8 SHA-256: 4ec93c38d5362d61a9e9c52611efc42303929b18b0da9d89a976f918e4fe37d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://zajinet.ru/strik?utm_term=mechanics+of+materials+8th+edition+beer', suggests a phishing or scam attempt disguised as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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.
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://zajinet.ru/strik?utm_term=mechanics+of+materials+8th+edition+beer PDF link annotation
- https://cdn-cms.f-static.net/uploads/4379848/normal_604310f560dc8.pdfIn PDF document text
- https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/mapadivejawon-vibamunaz-satupaki-bevofimud.pdfIn PDF document text
- https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/1348004.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446155/normal_60385bd3e1934.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476577/normal_602c45c72ba3a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4378856/normal_5fca6755ab0d8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474470/normal_60513401c5059.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4492586/normal_5fcabb72d9f93.pdfIn PDF document text
- https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/zafofufuzun.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482413/normal_605d5b5421d17.pdfIn PDF document text
- https://tuxazapewim.weebly.com/uploads/1/3/4/8/134846749/9c638ab.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/wiremeresegikon/carmeuse_holding_annual_report.pdfIn PDF document text
- https://s3.amazonaws.com/mevuzokekenojab/72235705061.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dfe17345-01a5-4b7d-9fab-e9e26c4ea57e/estudios_biblicos_para_jovenes_adultos.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2e83840b-0a94-43f8-89b2-e3d004327ff8/73901375842.pdfIn PDF document text
- https://s3.amazonaws.com/jolituzoji/41024780351.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/66ec513f-07a9-4aa9-bcfb-d42ab2d8af9d/art_of_war_best_hero_for_cerberus.pdfIn PDF document text
- https://s3.amazonaws.com/samopakamefap/amazon_prime_movies_mac.pdfIn PDF document text
- https://s3.amazonaws.com/widiku/41260438420.pdfIn PDF document text
- https://s3.amazonaws.com/rimepusox/acer_laptop_turn_on_black_screen.pdfIn PDF document text
- https://s3.amazonaws.com/bulalowisu/berserk_1997_ost.pdfIn PDF document text
- https://s3.amazonaws.com/gofiguj/how_to_play_40k_kill_team.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a2f9d336-6eeb-4957-bed2-9f3ec9699523/how_to_tell_if_a_compound_is_ionic_covalent_or_metallic.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
- 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_off0000e652.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE652	5600 bytes
SHA-256: `f778782b4709d12fc7063b4d9c4d3d36dfa4c9877542b9a19fe45ab8c0837245`
`font_01_sfnt_off0000f93b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF93B	11320 bytes
SHA-256: `5a5c26e51a9f89905dc9131722465d77c2220eff208c4b28253be6a6d7ac84df`
`font_02_sfnt_off00011fa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FA0	16084 bytes
SHA-256: `7bb111f4ce79ba48502a837b83d40e55cd246b86015b702aadb01736ca16f5d3`

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