PDF malware analysis — malicious · b72491ccc9ece287

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 15:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: 731285afdf8f776707435f1466f75395 SHA-1: f0109a20fba76c92b929da5533665128497ac7f5 SHA-256: b72491ccc9ece287aeac87cdbe4b2731d5dab64765abdfbc08a302bbbc6891ac

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 of which are hosted on disposable domains, indicating a link farm or SEO spam campaign. The primary external URI points to a URL that includes a search term, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
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://leonvi.ru/strik?utm_term=what+is+the+zip+code+for+where+i+am+now PDF link annotation
- https://cdn-cms.f-static.net/uploads/4479435/normal_60264f39ab099.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458848/normal_5fda026110ff0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4488581/normal_5fd8b10e675aa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4500893/normal_5fdf21a0bdc40.pdfIn PDF document text
- http://giwapozolaleg.mypressonline.com/zuwenatonogesupezip.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421629/normal_5fff6e488a94b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475565/normal_5fe7fa2684798.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413701/normal_5fe3b1ff51201.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464541/normal_602186f6154c6.pdfIn PDF document text
- http://wasegulom.mygamesonline.org/roland_fantom_x6_price_in_india_amazon.pdfIn PDF document text
- http://kejoxemubogese.mywebcommunity.org/letobanonuxikojawatow.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485939/normal_600923d84c777.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://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_e700df79630248aabf3c4f29cf366e6b.pdf?index=trueIn PDF document text
- https://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_820bb06d929845058fa5d9d091024017.pdf?index=trueIn PDF document text
- http://womejus.rf.gd/tanod.pdfIn PDF document text
- http://nubaletafo.epizy.com/infographic_timeline_templates.pdfIn PDF document text
- https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_4414ff0b2e354bfe9285cad433c232ce.pdf?index=trueIn PDF document text
- https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_b20daf3c60e94215bb927b1187ea73fd.pdf?index=trueIn PDF document text
- https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_fe73507f3b414914bae5bbc3db08ae0e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5B2	5304 bytes
SHA-256: `65c650d914d98b052c349e168978eb872f7f801f8d9adc76fe253e45cb753932`
`font_01_sfnt_off0000f7ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7AC	10632 bytes
SHA-256: `722d385cfe38605e5636f18728fed65d885d58236b55f5d11736d10a83d24d8a`
`font_02_sfnt_off00011c0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C0F	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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