PDF malware analysis — malicious · d26f8a8c1644ed0e

MALICIOUS

PDF

83.5 KB Created: 2021-01-04 00:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07

MD5: 66cf673ed417202eefbd939e1c146ec8 SHA-1: 87f30a1377cfa3ecd7ad0eea62eb84813e45ca5b SHA-256: d26f8a8c1644ed0eb31682d18cea58ee32c8433304b4716eabfa8dd14c45b5d3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable. The primary purpose seems to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=jumbalaka+jumbalaka+tamil+movie+song PDF link annotation
- https://balabirow.weebly.com/uploads/1/3/4/6/134690292/8bb377e7504.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406806/normal_5fdff7d992026.pdfIn PDF document text
- https://wuzivizafexun.weebly.com/uploads/1/3/1/4/131453021/6d86203e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367950/normal_5f887ba489d3d.pdfIn PDF document text
- https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/8e4f6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392664/normal_5fa77e6f69822.pdfIn PDF document text
- https://kenuvibugitevam.weebly.com/uploads/1/3/4/7/134700053/fivop.pdfIn PDF document text
- https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/52f0a76f0a3636.pdfIn PDF document text
- https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/vovatavamo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410006/normal_5f932c543c119.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393016/normal_5fb887ddb2397.pdfIn PDF document text
- https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/liweliwifisi-guvefewa-voxatagaxap-kidipo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- https://uploads.strikinglycdn.com/files/ba4bf65d-fdba-418e-9c0b-1924d9b939ea/ode_to_joy_piano_notes_with_letters.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/89a1aa16-0a11-44de-b791-cd102e413703/wekukelalewixutakemike.pdfIn PDF document text
- https://s3.amazonaws.com/luxaduzimase/bridal_wave_english_subtitles.pdfIn PDF document text
- https://s3.amazonaws.com/jukoxisojow/7738162019.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e31f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE31F	5236 bytes
SHA-256: `0279b3572fc595e610b4aa247a6972c8a79379aa2185a873b38a20da4fb8dc12`
`font_01_sfnt_off0000f4ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4EC	4168 bytes
SHA-256: `9e8d0c5fc0a6a80852617e522c84d03bebb6f0c7864621d3df2e25d20c5495cd`
`font_02_sfnt_off00010342.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10342	11372 bytes
SHA-256: `6050b95061cc12aafd26ec56496367ea98dfb91117d69483a2066d3562532e20`
`font_03_sfnt_off0001290f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1290F	16164 bytes
SHA-256: `ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8`

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