PDF malware analysis — malicious · 0b37e274dda5a68b

MALICIOUS

PDF

76.7 KB Created: 2021-06-01 12:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 4d82b6bb14a22732aa1b3fba45fd66b4 SHA-1: 00ee08ef24e79411a9c531b61fad560909970b3c SHA-256: 0b37e274dda5a68b16bf4be14e13bb5968d215abc9e8b2f16ec62893eb4da21f

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 numerous external URIs, with one prominent URL pointing to a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious link.

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://pistant.ru/pbw?utm_term=libro+de+matematicas+cuarto+grado+primaria+contestado PDF link annotation
- https://static.s123-cdn-static.com/uploads/4374360/normal_5ff62adec4cdc.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450156/normal_5fcd8a2ea37f9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4477655/normal_600499717cfc6.pdfIn PDF document text
- https://gilukuxuzi.weebly.com/uploads/1/3/4/4/134494221/wijowi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4371790/normal_606c77a0a0b08.pdfIn PDF document text
- https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/2d30d7139c9420.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417519/normal_601103a5c5270.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407064/normal_6039b8d994778.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450338/normal_602753daeb8f2.pdfIn PDF document text
- https://dijideloduxez.weebly.com/uploads/1/3/4/3/134362038/3beb150c269bcaf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417329/normal_6029b135d05d7.pdfIn PDF document text
- https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/3247262.pdfIn PDF document text
- https://febefadu.weebly.com/uploads/1/3/1/4/131453100/0009a1e476415e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4367311/normal_5fece7f838636.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446287/normal_603319be96be0.pdfIn PDF document text
- https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/vawinitoto.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://gatasulupu.pbworks.com/f/rajuxovogutaziti.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/72d1a09f-0560-48c0-97ae-da3b10ac09e3/niruposemomiwodamafejeso.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/72c1a165-3b85-446f-9a5f-283f11cf543b/broan_allure_36_inch_range_hood.pdfIn PDF document text
- http://mudowomuxexo.pbworks.com/w/file/fetch/144422583/how_much_is_a_1995_meowth_pokemon_card_worth.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/becbe73e-e9fa-40d4-b735-6d0e07245f43/why_does_it_hurt_when_someone_touches_my_belly_button.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/105f6336-1b93-48de-a3fe-951916ec6cee/how_god_changes_your_brain_free.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/44c4b03e-13a5-4b1f-a569-f6b611b1d2b7/vinaxun.pdfIn PDF document text
- http://jobojifitin.pbworks.com/w/file/fetch/144449889/ielts_writing_task_2_questions_and_answers.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_off0000ed18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED18	5440 bytes
SHA-256: `b21ff9e72922c658efc55f2113471b42d4b52061b2d4e641691b49dfb93ca728`
`font_01_sfnt_off0000ff7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF7E	10756 bytes
SHA-256: `9894c10748c604e8301174677fbafa9755cac1a5f12f88725ed7a61e18190a7e`

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