PDF malware analysis — malicious · c18eb811184a857d

MALICIOUS

PDF

64.7 KB Created: 2020-11-20 08:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 6ca5e015d67232069b0628a164d913df SHA-1: 120f84c31932e9a37b4bc4baf664af5d374ce241 SHA-256: c18eb811184a857d2aca0187628b473bd10481e3d00366a4f433869a23cad489

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

Heuristics 5

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://gettraff.ru/aws?utm_term=my+garden+answers+app+review
- https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/joxiwepavala_vobaposojedo.pdf
- https://cdn-cms.f-static.net/uploads/4449178/normal_5fa2f3bca0183.pdf
- https://cdn-cms.f-static.net/uploads/4402940/normal_5fadde8b8a11a.pdf
- https://cdn-cms.f-static.net/uploads/4367304/normal_5f8766b7981bf.pdf
- https://cdn-cms.f-static.net/uploads/4366952/normal_5f87be8c32a42.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/nujosuwemedadi/mbta_newburyport_line_train_schedule.pdf
- https://s3.amazonaws.com/kiwopusafize/56412871029.pdf
- https://s3.amazonaws.com/pexodugosa/naruto_shippuden_senki_apk_full_version.pdf
- https://s3.amazonaws.com/nabifovu/wind_turbine_failure_rate_2019.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c1c2.bin` `795086673b9be6d2a35696a3525f44ff96e70de24f592f10e9712c798d50bbfc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1C2	5352 bytes
`font_01_sfnt_off0000d434.bin` `57717b760a16e172d3682e6084c42f0b79e3ec5dacf34c317f7aa05cc11d92d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD434	10048 bytes

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