PDF malware analysis — malicious · f09a019a07446d5a

MALICIOUS

PDF

86.3 KB Created: 2021-04-08 23:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 077a074f38cde3f76a6d410787d44ac9 SHA-1: 0b4d5ff8e12d3765f715ebe85ddc0fef2c6d5144 SHA-256: f09a019a07446d5a5fedbbadab3ddcb4e6ed4e04e717a336128e010ad13446d9

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links pointing to various domains, many of which are identified as disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary technique being Spearphishing Attachment (T1566.001) due to the nature of PDF documents often being delivered via email. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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
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.
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://midufefew.ru/strik?utm_term=36+month+old+cognitive+development PDF link annotation
- https://girezerel.weebly.com/uploads/1/3/1/0/131070389/396241.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459785/normal_5fddf47c0cc02.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370087/normal_5fd84192c3ad3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4497075/normal_6064d41fe8216.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387816/normal_6041668b0abc1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417530/normal_603d8998a319a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392658/normal_5fcd961b37d67.pdfIn PDF document text
- https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/busominajekefewapitu.pdfIn PDF document text
- https://somokowu.weebly.com/uploads/1/3/1/3/131383604/faputa.pdfIn PDF document text
- https://zirawasapawati.weebly.com/uploads/1/3/4/8/134878995/kelezin.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4457577/normal_5fffdb84392f7.pdfIn PDF document text
- https://cdn.sqhk.co/nevupediwix/hghejah/digimon_xros_wars_episode_1_online.pdfIn PDF document text
- https://cdn.sqhk.co/pananumujo/jgdkgfx/mythic_eternal_palace_guide.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4499285/normal_605458bfe0bc8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460677/normal_6033bc47450db.pdfIn PDF document text
- https://cdn.sqhk.co/wejawujagi/rjfM1ji/beluluxizivukufeder.pdfIn PDF document text
- https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/kesumix.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/xedewofuretujo/trinomio_cuadrado_perfecto_ejercicios.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/26c787ba-470f-4559-9caa-f55db6947d89/82218227817.pdfIn PDF document text
- https://s3.amazonaws.com/xonobijikivo/hall_ticket_tnpsc.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bf6624b8-5dbf-4e3a-abaa-250d3f6131a0/4293219923.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f79352f8-4c67-4228-b777-3caf13ad264f/wekovijufox.pdfIn PDF document text
- https://s3.amazonaws.com/jusuberu/star_trek_discovery_season_3_episode_8_review.pdfIn PDF document text
- https://s3.amazonaws.com/rufonali/67485034245.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_off0000fe50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE50	5284 bytes
SHA-256: `40a15f80f5999743fcfbc449a9b6b044e63e747ccc21ff90e76ea4ee934678c0`
`font_01_sfnt_off00011032.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11032	11192 bytes
SHA-256: `a9e6684f6a212eb9b987f466c8729aa58d2cba636cb99bd499b142c08f01e376`
`font_02_sfnt_off0001368c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1368C	16060 bytes
SHA-256: `d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7`

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