PDF malware analysis — malicious · 6525f22a18520412

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 19:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 5892bd22bb63be75246295636a76ab1d SHA-1: 373ba0a82907f5b69314aeace6031110a9bb7b49 SHA-256: 6525f22a1852041207fe17f88d8ec22ddfbeee46ac9b29936630955c8fc73ec8

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains numerous links to external PDFs hosted on disposable domains, suggesting a link farm or redirection mechanism. One high-severity heuristic specifically points to a PDF link to an algorithmically-generated URL, which is a common tactic for distributing malicious payloads. The document body is heavily obfuscated, but the presence of external links and the overall heuristic profile strongly suggest an attempt to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://crewmak.ru/uplcv?utm_term=song+lyrics+apk PDF link annotation
- https://habibitoursegypt.com/ckfinder/userfiles/files/13561216183.pdfIn PDF document text
- https://nmg.lv/img/uploads/files/vetokuworidez.pdfIn PDF document text
- http://hykylalumni.org/userfiles/tevosavebadugewufurosu.pdfIn PDF document text
- http://pibar.tw/uploads/files/202109021418434005.pdfIn PDF document text
- http://qqwandai.com/uploadfile/file/foxizedagin.pdfIn PDF document text
- http://ambulatorioveterinarioscapindandrea.it/userfiles/files/kijavatipegijemiguno.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbe976635---vefogiwifagododigak.pdfIn PDF document text
- http://hvpeds.com/upload/contents/file/warejir.pdfIn PDF document text
- http://teusz.pl/UserFiles/file/kejopidejagatowesedub.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0ea67b4a5cf9a8e619bf0f097124de74/57002959919.pdfIn PDF document text
- https://rugerwafers.com/demo/ruger/beta/userfiles/files/ritojegofaxazezidori.pdfIn PDF document text
- https://minhvuongthuphap.com/upload/ck/files/gopegazegidiji.pdfIn PDF document text
- http://pngroup.pl/ckfinder/userfiles/files/78925266435.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/53892555644.pdfIn PDF document text
- https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/dujumaku.pdfIn PDF document text
- https://doina.md/fckeditorfiles/file/xabiresevo.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/lolawizevazojowugojugirib.pdfIn PDF document text
- http://maslatalaia.com/userfiles/file/zimonerowubinuluxewavebo.pdfIn PDF document text
- http://yomamasushitogo.com/uploads/files/32139332494.pdfIn PDF document text
- https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/daxuge.pdfIn PDF document text
- http://denprokhorov.ru/images/file/dutusatejotabezudisigabo.pdfIn PDF document text
- https://uzmanwebci.com/calisma2/files/uploads/22502930389.pdfIn PDF document text
- http://jumpstart.mobi/ckfinder/userfiles/files/93542836171.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b79a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB79A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cfb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFB1	10600 bytes
SHA-256: `c7ec5c0ec2c5ad4af29665e62fad4d7cfc3892185b9daf66f81ffa48df843726`
`font_02_sfnt_off0000e7fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7FD	17056 bytes
SHA-256: `95a12dc73b82baa2086b9b1f24d6cb2ae83968b23711fc6bfcd045fc818bfbed`

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