PDF malware analysis — malicious · af56d909ff01f926

MALICIOUS

PDF

92.8 KB Created: 2021-03-22 21:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 3118771dce24a3655e0d0bd6cbe36d27 SHA-1: f55ebd9eafb86fbfc46c345ab8935e690ec6216b SHA-256: af56d909ff01f9267b3c3eb42215de5ec5871243e5fbaa893c2e0b15113734a6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=what+is+the+purpose+of+everyday+use+by+alice+walker PDF link annotation
- https://static.s123-cdn-static.com/uploads/4372371/normal_5feb7dc466df5.pdfIn PDF document text
- https://cdn.sqhk.co/waxobakal/cEkpohb/ntpa_tractor_pull_urbana_ohio.pdfIn PDF document text
- https://josubolifixit.weebly.com/uploads/1/3/5/4/135400154/pisoralamit_koluvukubowajiz_dodimupojidufog.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387816/normal_5fce46d7616c5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383160/normal_601ab6aa43713.pdfIn PDF document text
- https://cdn.sqhk.co/rogevuzazi/T6hdXif/ariston_water_heater_15_liter_manual.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366399/normal_60028c3f478b5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387054/normal_603275602768a.pdfIn PDF document text
- https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/gozeb.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4449783/normal_6005d95538648.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412380/normal_602f58d3183a5.pdfIn PDF document text
- https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/dovizunaroka_xizofow_gavomevuvulagif_dewinoxuvusi.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4455881/normal_600253a376726.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392474/normal_6051c45f9eeb9.pdfIn PDF document text
- https://fawonise.weebly.com/uploads/1/3/4/3/134327557/9403967.pdfIn PDF document text
- https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/famuzik_wewoburetef.pdfIn PDF document text
- https://cdn.sqhk.co/vofemolat/fxhdXii/chinese_font_design_free.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_8c73d05eaabf4730b4062c6fd0eb69fc.pdf?index=trueIn PDF document text
- https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_4d7b2ca0f8ae4782a2c1d3e049ea36b9.pdf?index=trueIn PDF document text
- https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f58617092f9948d884bdabda26d6b9fe.pdf?index=trueIn PDF document text
- https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_8456374ce1bf467caf1865b7f4850dc4.pdf?index=trueIn PDF document text
- https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_e319063a74314957bd9dc0c2da6fdd6a.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000114b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114B9	5716 bytes
SHA-256: `27f5e68b683e2d87a881b5e6429412c1c1774a90486bf440de5342bf334db1dc`
`font_01_sfnt_off00012842.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12842	11104 bytes
SHA-256: `9dc0a9ada0a0d6757d8423cd2a973cb96590a23d21d37d4106eb35fb4024ec88`
`font_02_sfnt_off00014e04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E04	16204 bytes
SHA-256: `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`

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