PDF malware analysis — malicious · 4868c49c1d44beab

MALICIOUS

PDF

74.2 KB Created: 2021-06-12 06:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: d0183255a202859b947908fb3048aa0c SHA-1: 6a3c8ec1a33158d7ec5f5233ae481ed29b32415b SHA-256: 4868c49c1d44beab504a66e5bb86790147d7cf141c492ebbc9544968ffb46092

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://infrive.ru/pbw?utm_term=grade+2+subtraction+worksheet', suggests a lure related to educational content to disguise malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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://infrive.ru/pbw?utm_term=grade+2+subtraction+worksheet PDF link annotation
- https://duweliga.weebly.com/uploads/1/3/4/5/134593675/peret-ligepu-zenog-pupojo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4449781/normal_5fc86d61dee03.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384160/normal_5fe6708c650cd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482426/normal_6055f1f15bca3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480589/normal_60c0fdb61226b.pdfIn PDF document text
- https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/805e82f3c0b2f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485813/normal_600fc36fb13c7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468540/normal_600a4ee06ed0f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462694/normal_601d95f573acc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384633/normal_603fc5989b744.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465136/normal_602b8b6801040.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4463788/normal_5ff7ad288bdb1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4499958/normal_5fe55614816c8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407733/normal_5fd165a961ec2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412160/normal_603de98452cef.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/7d038a86-bc37-4d98-b7cd-ce236ebe7ade/81998212548.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cd3698af-503d-4e95-b7a3-43549cdb2b7f/8418777793.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0fe4c5d8-528e-4dfd-86a1-ca41309a06fe/bixipo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3f9c76c3-277c-431e-8b52-1e49dca78e6e/44565207968.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b6921682-019b-4d49-b474-d9968d20f3ca/safety_not_guaranteed_story.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/41025b72-e4c2-4be6-bbd9-4ce95dc23c65/is_sword_art_online_a_romance_anime.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/36d40dc0-49b4-487e-bccd-336002a685a6/100_job_interview_questions_and_answers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/296f1e29-cc09-4a77-bde3-c490cc348f79/21123025189.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b73f29a9-152a-4c99-b55b-bae27f941f36/how_long_do_delonghi_oil_heaters_last.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9F7	3832 bytes
SHA-256: `e3b0f419c514e76b325f09a78e35d0c8f8a0c1a6ba82676f311b188c60c9c705`
`font_01_sfnt_off0000e7c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7C1	5456 bytes
SHA-256: `d736aea39291f1050fd914ae114435bef9c841357ac279c773d626d1c5e3e297`
`font_02_sfnt_off0000fa5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA5A	9504 bytes
SHA-256: `f436945b49064dd02b5851c98cd49ea765581261d14efd80d961557a86c50990`

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