PDF malware analysis — malicious · 77bb5ba58ac911fc

MALICIOUS

PDF

70.3 KB Created: 2021-05-28 02:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 6d21b9a993a23d7c20c57aaa854556e5 SHA-1: 585610906b1868585f5e889e89d661fec18e7570 SHA-256: 77bb5ba58ac911fc24d648780de5773b89a641eca58a542ceffacb0f56a27323

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9992

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 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://botokaw.ru/strik?utm_term=libro+de+tecnolog%25C3%25ADa+3+secundaria+contestado PDF link annotation
- https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/zofutid.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469358/normal_606c8e12a826b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4501775/normal_600157e191878.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4406168/normal_60627c525147e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451376/normal_6043e1f7a3b86.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4471948/normal_60048eb168295.pdfIn PDF document text
- https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/76cb24.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447436/normal_602f6816709cc.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4449600/normal_5ff4ba711be81.pdfIn PDF document text
- https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/sanabakilixoda.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/50ef63e9-b2c6-442e-a212-bf23a82f3308/ibn_in_english.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/205eb277-d4e9-4173-80b7-bcf9415e8c7a/1956018807.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1d54d6f7-1600-43dc-b68b-61e9a62ef870/9082499073.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1116f96e-37f9-4f2c-a462-71c4554e8a14/good_coach_quotes_basketball.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f8eeadba-a7fb-43b2-ae65-f35172adfb46/conflict_management_strategies.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8c9b7cd6-835f-4941-91e3-0c05d575ef82/roxilo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/767830b5-44f9-4cb8-b2ca-2a8ec5008ade/zifetorekevumukel.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/439668e0-75d9-4887-91bd-55af467725a5/40320507834.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c25c4bb0-de26-4b22-9f75-380b4c0272d4/55136902330.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1c4d00ff-a11f-4457-98e2-a80520f6be00/short_story_activities_for_middle_school.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f6754a13-bd5e-4bcf-a97f-7f45f6edf342/majoxolamake.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d40b1218-cb3f-4356-a3d0-2b09051f462f/que_es_un_estado_social_de_derecho_en_colombia_yahoo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9c5bc77d-573e-47c1-a1ef-80ae0db82f17/lodizunikuvodijifi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/38d03489-d334-400a-a276-dc3226a820cc/gre_words_app.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/69765827-01ee-4e03-b142-47cc63df52a4/why_finland_has_best_education_system.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_off0000d31c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD31C	5408 bytes
SHA-256: `df21a092aaf37f4355238f47c41018045dfdcc699cdd40647e3d52f0b6331754`
`font_01_sfnt_off0000e590.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE590	10976 bytes
SHA-256: `91de3a7045dce13188538e7c5fbcd1b96bebfa47f0af5f132575fdfd347c08a7`

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