PDF malware analysis — malicious · 855ad1d7f88b7f4a

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 09:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 764bbacc05827f19d3c0544e21e7560d SHA-1: b0afa2f974616ec4cf1c1e4158eb4a1cd389b730 SHA-256: 855ad1d7f88b7f4ab8c0cf9519f359e7fb6ad1c75efbb03dbefafe9b04378838

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It employs SEO link farming techniques, embedding numerous links to external PDFs, many of which are likely lures for phishing or malware distribution. The primary URL, https://pelibifir.ru/wix?keyword=john+nes+apk, appears to be a redirector for distributing malicious content, disguised as a datasheet or manual.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://pelibifir.ru/wix?keyword=john+nes+apk PDF link annotation
- http://dujojiwasemob.mywebcommunity.org/28953438693.pdfIn PDF document text
- http://mosebuzixat.mywebcommunity.org/thyroid_and_antithyroid_drugs_medicinal_chemistry.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4471995/normal_6002d06048b90.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4504554/normal_6011b60f38e7e.pdfIn PDF document text
- http://kimisorunutom.medianewsonline.com/cable_tray.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412606/normal_5fee30aa667f4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446649/normal_5fe207dccb4d3.pdfIn PDF document text
- http://nawitebexu.medianewsonline.com/roland_barthes_mitologias.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://mevalegija.rf.gd/checkpoint_5200_ngtx_datasheet.pdfIn PDF document text
- http://ruzapuxaxesiluw.rf.gd/ipod_shuffle_fourth_generation_user_manual.pdfIn PDF document text
- https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_906bf9e99a5249a8a8327b0a126afdc2.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gewuwasi/fallout_76_tadpole_exam_answers.pdfIn PDF document text
- https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_c7319051553c405f8457a7a59bc3b8db.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/numunenoji/17946610699.pdfIn PDF document text
- https://s3.amazonaws.com/defujo/payaliya_bajni_lado_piya_song_bestwap.pdfIn PDF document text
- http://zobuwijezad.onlinewebshop.net/liwisimozideze.pdfIn PDF document text
- https://s3.amazonaws.com/votuweroxigezog/texiri.pdfIn PDF document text
- http://wesaxerofirivo.epizy.com/67734736414.pdfIn PDF document text
- https://s3.amazonaws.com/xafaxotaful/cryptic_quiz_worksheet_answers_key_page_120.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d621.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD621	2880 bytes
SHA-256: `aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344`
`font_01_sfnt_off0000e05f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE05F	4832 bytes
SHA-256: `3d6f957ddf08a60f07a988722b6f3cfb628a7460c7c9d77dec614229e3b9771d`
`font_02_sfnt_off0000f0c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C3	3024 bytes
SHA-256: `cf5ed4f450e5fc1fa31c8ac31b5dbd05637a4ba05cdfa332ae769b600578e534`
`font_03_sfnt_off0000fbf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBF1	12164 bytes
SHA-256: `90ad127589446aa0fa3a17c88182213d27812cce974f10a85a5a24d8cfe41a4a`

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