PDF malware analysis — malicious · b7ab604120a5e3f2

MALICIOUS

PDF

82.9 KB Created: 2021-03-15 11:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: b94aaa2f3ab6284b67f6d857d84838f1 SHA-1: 50b425d42bc1336396443522c8d6827f717f6f3c SHA-256: b7ab604120a5e3f2a02faa1eef3c59e790dcfc82dcc0fdbfdf43aa6b16fc1082

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting or suspicious domains, suggesting a link farm or phishing attempt. The presence of invisible links to domains like 'securityofusersdevicesonline.site' indicates a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE

PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
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/award?keyword=effects+of+alcohol+on+academic+performance+pdf PDF link annotation
- http://50offstore.pro/samsung_un46b6000vf_manual7idyg.pdfIn PDF document text
- http://securityofusersdevicesonline.site/dizulasoboguwidatitxdszm.pdfIn PDF document text
- https://gezonawaja.weebly.com/uploads/1/3/4/6/134685915/683902.pdfIn PDF document text
- https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/puzoni-wokumir-dekolefaditasij.pdfIn PDF document text
- https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/tinolisopawis.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
- https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_3d276bf46d9f4fccbfe519aebe7cdf0b.pdf?index=trueIn PDF document text
- https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_be18b1f21dc44b27a6d774b747f3ccbe.pdf?index=trueIn PDF document text
- https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_75fab48c482048b481f766386d06aff2.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b1377acb-de14-4c3c-a2a8-18ca83b04d89/46938655089.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/964ccb6d-9996-4560-a755-d3020d782ced/rapugeleb.pdfIn PDF document text
- https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_775b6d6737934ad689afe17a653568c2.pdf?index=trueIn PDF document text
- https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_12b8c1b40bb04e39aa1a8eaeb75fb941.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/5132aba1-f45b-4004-b758-7a96bc3227f7/julian_date_298.pdfIn PDF document text
- https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_0a5a48ca6d4545e5b6dd04324bf1d706.pdf?index=trueIn PDF document text
- https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_b9b48f5218774e999358231366c49e5b.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/19cd3186-1c4f-4829-85fd-30a2452d9f93/vejunugatusizigub.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ad5aa1ee-4bb8-4b16-8c40-abab55a44f2b/82793541852.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/13a0ffb8-2049-454e-be2b-ca0f12df4e5d/champion_generator_wheel_kit_40065.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6582a56f-13f3-421b-a36f-b45e5954292d/9204083137.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_off0000f87d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF87D	5140 bytes
SHA-256: `d8907e5986a3bf41031327a3dcce1c6bd790b0b7da0f339ea9795d35073886b2`
`font_01_sfnt_off000109b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109B7	11220 bytes
SHA-256: `96f4f83fdb86033f0852446c0c76a8f0d7bf3f86d103c31c714684bfb544fc1c`
`font_02_sfnt_off00013018.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13018	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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