PDF malware analysis — malicious · 72181c8904f6ea25

MALICIOUS

PDF

70.0 KB Created: 2021-05-29 08:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: a3f80797731a351e89b12b9da22e4c16 SHA-1: e9a79ef05aec6040d27fb5504b1f0c468fc044b6 SHA-256: 72181c8904f6ea2509de6e2b084de2b388cec8f31e5772e46642581c881aeb38

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure for biology study materials, likely to trick users into clicking the embedded malicious URLs.

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://druttle.ru/strik?utm_term=10.+s%25C4%25B1n%25C4%25B1f+biyoloji+konu+anlat%25C4%25B1m%25C4%25B1+indir PDF link annotation
- https://cdn-cms.f-static.net/uploads/4495976/normal_60401008d5f43.pdfIn PDF document text
- https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/d5bb4bdeef.pdfIn PDF document text
- https://zolumidesejutis.weebly.com/uploads/1/3/5/3/135327041/jevirujiri.pdfIn PDF document text
- https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/womelinedarowerewiz.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383797/normal_5fca59e0caa2e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4496389/normal_6049389473a7f.pdfIn PDF document text
- https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/87bc0040343.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456389/normal_604e1d9b660f7.pdfIn PDF document text
- https://nakilogizo.weebly.com/uploads/1/3/4/3/134363069/372854.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476947/normal_6061c0c211396.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459654/normal_606b78545f5bd.pdfIn PDF document text
- https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/aa835a9384.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://uploads.strikinglycdn.com/files/38b822df-16ec-4e7c-905f-3c7469cae615/article_writing_jobs_work_from_home.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/da884580-c1fb-4378-a7b6-3d5c073bbe48/xavujubuvunuwugobovekofo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7b91c42e-62e6-428e-94f0-160ec154224d/how_to_sell_a_documented_boat.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3e169817-c5e3-4ce4-b776-df7d11c765c3/mazibufelowuk.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cb6daf84-1d01-4c5a-92c3-ae34d8d90c7e/94753981844.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_off0000c3ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3AC	5364 bytes
SHA-256: `30ed98cb9e195b0341a58338381ade8c531f341541fe85a9df903179896c8b3a`
`font_01_sfnt_off0000d5c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5C7	11516 bytes
SHA-256: `3ba6f591b78c968922e86d271aed0a7530971104450233d19219c624edce4742`
`font_02_sfnt_off0000fa70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA70	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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