PDF malware analysis — malicious · 41445a7ed90f36e4

MALICIOUS

PDF

84.9 KB Created: 2021-05-25 05:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: da803d203385e0e8ba74b73aa619582c SHA-1: 741cbc9f69ad3eb3f4a483954848a630a96c56a5 SHA-256: 41445a7ed90f36e45a9c3138c9568a23d8847afad896eb8e2b6eb2aa2cb90085

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains a lure related to changing a Dexcom transmitter battery, which is likely a pretext to drive traffic to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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/strik?utm_term=how+to+change+dexcom+transmitter+battery PDF link annotation
- https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/9409b77b04.pdfIn PDF document text
- https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/dosivi_neretugimafe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478703/normal_5fe7bd7f84293.pdfIn PDF document text
- https://tefawizudarezuf.weebly.com/uploads/1/3/4/6/134640126/1641113.pdfIn PDF document text
- https://mizabago.weebly.com/uploads/1/3/5/2/135299272/c42898ece1d78.pdfIn PDF document text
- https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/boliru.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407303/normal_5fe7ecf0a2d57.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375339/normal_6024f5b3501c0.pdfIn PDF document text
- https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/6444766.pdfIn PDF document text
- https://lefusovu.weebly.com/uploads/1/3/4/0/134040443/7007459.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383804/normal_60175ad4144cd.pdfIn PDF document text
- https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/8445940.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://s3.amazonaws.com/retisovojor/88640104247.pdfIn PDF document text
- https://s3.amazonaws.com/xamapebonijos/stephen_king_misery_book_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/66e705a0-a10d-4c4d-b606-7a7bff3fe39a/is_call_me_by_your_name_book_graphic.pdfIn PDF document text
- https://s3.amazonaws.com/wusone/riwarazalibawedorojutaso.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d86f9e9a-a4cb-4d79-bc3c-225ea7255575/foniraxujotefiguto.pdfIn PDF document text
- https://s3.amazonaws.com/tomamujuf/divinity_original_sin_enhanced_edition_walkthrough.pdfIn PDF document text
- https://s3.amazonaws.com/zabejuvijolu/4405618618.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_off0000fda3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDA3	5472 bytes
SHA-256: `d0770f00b94c0e522b0ab692f70aabd1d3324a5fed918131df1e5dc73e98ebf0`
`font_01_sfnt_off0001101e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1101E	11776 bytes
SHA-256: `fe3602bc7a387cc53118d0ea91cd7790a7e074e0cf4af03a17fd809dbefd09cf`
`font_02_sfnt_off0001381f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1381F	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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