PDF malware analysis — malicious · 6d9129ed5feb2a0c

MALICIOUS

PDF

91.1 KB Created: 2021-03-18 03:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 5184cace705e62ed32e0c2936f915760 SHA-1: 903fd90755d90c4137839811fc0bfcca1b724cad SHA-256: 6d9129ed5feb2a0ca2303acee8d6508b3a5efb6d3114fe4b8a99b53c97d6451c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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://xezojetit.ru/123?utm_term=brondell+s1000-+ew+swash+1000+manual PDF link annotation
- https://static.s123-cdn-static.com/uploads/4375356/normal_6004350b2f0f0.pdfIn PDF document text
- http://tonedomopoja.scienceontheweb.net/19472031064.pdfIn PDF document text
- http://nekidifuton.medianewsonline.com/pattern_oriented_software_architecture_volume_1.pdfIn PDF document text
- http://brosbass.com/nukelijukw6cye.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373243/normal_5fd92730b0634.pdfIn PDF document text
- http://filanion.online/femimozekopotigazopvmgng.pdfIn PDF document text
- http://huaweistoreukr.xyz/star_delta_wiringnq02q.pdfIn PDF document text
- http://sibuvre.com/xiworesopeqxt.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4474759/normal_5ff63af82ee6b.pdfIn PDF document text
- http://drovazvenigorod.ru/elements_of_a_story_worksheet_grade_59sh8s.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/30040014-d5a5-4c59-965c-acd7ef706587/rilemibojomadosimuvefak.pdfIn PDF document text
- https://s3.amazonaws.com/mavixu/6512472440.pdfIn PDF document text
- http://rowoniwetob.atwebpages.com/32746909466.pdfIn PDF document text
- https://s3.amazonaws.com/nedijowewoded/how_to_add_pinyin_to_chinese_characters_in_word.pdfIn PDF document text
- https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_39e22842095740d09c99c4838d85069d.pdf?index=trueIn PDF document text
- http://fugufaza.myartsonline.com/shake_hands_with_the_devil_book.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f941846b-e897-4d77-b1ca-19644ff0f27e/high_pointe_microwave_convection_oven_owners_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/263cf6cb-9d8b-4169-9ae5-2976d812ba41/jugogameteka.pdfIn PDF document text
- https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_9e68b724c52b4bc5961715105bc2bd2f.pdf?index=trueIn PDF document text
- https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_57ed8917ac73443c87c963bb6c3cc109.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011760.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11760	5188 bytes
SHA-256: `02e70fcb66f67c99a82430b2ef179babfb20f8c6c6b0a984868fe9f233dba6be`
`font_01_sfnt_off000128e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E4	11820 bytes
SHA-256: `b35fc54d8f664f76aa70cb1808f6aaffb65fa0e767f41f6297e25ce7715128f9`
`font_02_sfnt_off0001509f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1509F	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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