PDF malware analysis — malicious · ac01770c1f07ede3

MALICIOUS

PDF

78.9 KB Created: 2021-02-28 02:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 124e8c69b03c16111eb7364aa34bb209 SHA-1: a0da4a6e1d7734c64a44df9c022cfdf75cd3cd8f SHA-256: ac01770c1f07ede36fee395651de97b22d7b9b7d617eaf7ce829568a333ab686

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' further support this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
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://nipisod.ru/aws?utm_term=after+we+collided+cast PDF link annotation
- https://cdn-cms.f-static.net/uploads/4468823/normal_5fd2a25b7c008.pdfIn PDF document text
- https://cdn.sqhk.co/wogefosa/g5Nibfw/highway_to_hell_guitar_tab_songsterr.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4488332/normal_5fd33259868d6.pdfIn PDF document text
- https://cdn.sqhk.co/pasezateda/dbkJzN3/12802956210.pdfIn PDF document text
- https://cdn.sqhk.co/legusovej/Axszgid/41933371123.pdfIn PDF document text
- https://cdn.sqhk.co/vafexifere/KPiiLnp/xunovasemapite.pdfIn PDF document text
- https://cdn.sqhk.co/gowamojon/8IDbjhb/85046136879.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393904/normal_5fddf4a6071d3.pdfIn PDF document text
- https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/merupadatiso_namabuxo_nixatopoxixu.pdfIn PDF document text
- https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/7fa0733f8ab249.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4385876/normal_5ffa0c7b8ecef.pdfIn PDF document text
- http://juwolopuga.66ghz.com/jovutozumazowakegikupom.pdfIn PDF document text
- https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/7465439.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4405179/normal_5fe40dbef0f46.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://tujevudaxuxos.epizy.com/cbse_guide_class_11_geography.pdfIn PDF document text
- http://bajokekez.epizy.com/49807217620.pdfIn PDF document text
- http://dudibagigop.rf.gd/how_to_stretch_a_karate_belt_wikihow.pdfIn PDF document text
- https://s3.amazonaws.com/xamibebulosaxug/ijazat_video_song_720p.pdfIn PDF document text
- https://s3.amazonaws.com/pusori/tolewirebiratofobefisod.pdfIn PDF document text
- http://midelex.epizy.com/zuxotasorerajerun.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_off0000ebc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC2	4776 bytes
SHA-256: `1ac334789b65833c8ccd2c23d590a3e113e7ef26c2ebefeb4a611c5e030d3682`
`font_01_sfnt_off0000fc1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC1B	10444 bytes
SHA-256: `02250e59d0bcfdc02523ea6171bf2c766d44744d0edd2247177bc26ba4157c63`
`font_02_sfnt_off00011fde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FDE	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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