PDF malware analysis — malicious · 173a1e32da452d51

MALICIOUS

PDF

81.8 KB Created: 2021-03-30 13:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: c9b0d4663aa753b5d5c5f2941e272fa3 SHA-1: 5c5c463ec617de11ac7a47296aed2d3275f16f52 SHA-256: 173a1e32da452d51b16f126d843d9138e6ea1412c5a2a8bd8f2307c413a8d8d1

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious websites. The primary URL identified, 'https://nipisod.ru/wix?keyword=oraci%25C3%25B3n+a+san+judas+tadeo+para+el+amor', appears to be an SEO redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=oraci%25C3%25B3n+a+san+judas+tadeo+para+el+amor PDF link annotation
- https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/nadozifudon-gofunivaj-fifagulazenek-namavete.pdfIn PDF document text
- http://zisuroto.mygamesonline.org/sunbeam_fan_heater_reviews.pdfIn PDF document text
- https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/maludare-jizewakuje.pdfIn PDF document text
- https://luludosob.weebly.com/uploads/1/3/4/7/134703274/55f6502dc13a8.pdfIn PDF document text
- https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/3111195.pdfIn PDF document text
- http://kakorixow.mygamesonline.org/79745623277.pdfIn PDF document text
- https://nozoxajomakod.weebly.com/uploads/1/3/5/3/135332829/xafevelipavid_muxotevexuju.pdfIn PDF document text
- https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/fokekixiliw.pdfIn PDF document text
- https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/822a60a1941ce.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_3ecfe784e61d47eca17c397db1e93f63.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/lewuli/betting_tips_vip_daily_prediction_apk.pdfIn PDF document text
- https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_a345168f012d42f9ab2d02d3a882430f.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/fuzafuzeruwit/aesculap_neurosurgery_catalogue.pdfIn PDF document text
- http://kepofif.onlinewebshop.net/vazuv.pdfIn PDF document text
- https://s3.amazonaws.com/lewuli/astro_a20_gen_2_review_xbox.pdfIn PDF document text
- https://s3.amazonaws.com/jawusawar/rekodopixejamigikamif.pdfIn PDF document text
- https://s3.amazonaws.com/dozuga/tajuxobafatapevotolafixid.pdfIn PDF document text
- https://s3.amazonaws.com/niwotipugonuvoz/66434353919.pdfIn PDF document text
- https://s3.amazonaws.com/xojafemori/58946992992.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_off0000f55d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF55D	5460 bytes
SHA-256: `df2c21a06118c5dafedaf13cc284e048c9d558ca210e14fdb90bd88483c9682e`
`font_01_sfnt_off00010790.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10790	2272 bytes
SHA-256: `dfce47fd248616926aa43f5790e10dbb448844f1f73c88551c972bccff31356e`
`font_02_sfnt_off00011212.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11212	11648 bytes
SHA-256: `79d52b93803b4c49248e0169f5a4fabad8740762d63791e7a2e2e543e6f5be51`

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