PDF malware analysis — malicious · 9b9cd8418b892965

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 01:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 8304ad77b8ba4cd8a161427b496e43fe SHA-1: b2ba570de938e55d8658fd3f25d50da61eb8fc86 SHA-256: 9b9cd8418b892965b3b0427e3e85c7f96bb66bf50b7db082cbd0a45ac74be2af

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
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://resalured.ru/award?keyword=list+of+countable+nouns+in+english+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4495390/normal_5fe02b0696cc8.pdfIn PDF document text
- https://cdn.sqhk.co/pumopijaku/d11gvhd/handbook_psychological_assessment.pdfIn PDF document text
- https://cdn.sqhk.co/nububufi/bggLiig/58566965273.pdfIn PDF document text
- https://cdn.sqhk.co/wajewukudino/Fsgghjs/38563125090.pdfIn PDF document text
- https://cdn.sqhk.co/xusawikorut/jhfhiib/first_aid_training_online_course.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384310/normal_602f998e8da93.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_443207b112164f5caf043e7f02c13684.pdf?index=trueIn PDF document text
- https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_ac561226bc3c4ce289a2c5222c4f924e.pdf?index=trueIn PDF document text
- https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_d98ec832fdd84c32aca60dd7ece0061a.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/mubemutolewe/25636014442.pdfIn PDF document text
- https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_f4f3af543ccf41e3a167978dded8f06a.pdf?index=trueIn PDF document text
- http://goxabobuti.rf.gd/the_economics_book_big_ideas_simply_explained_download.pdfIn PDF document text
- https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_c84aead7e665414982f9bc8f7c895f31.pdf?index=trueIn PDF document text
- https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_b00738c08560463ab8734c4aa59dfd70.pdf?index=trueIn PDF document text
- https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_ca1196b2a144409985620c160afae4d6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/banula/54356729652.pdfIn PDF document text
- http://zokugapifixi.rf.gd/gixixabomokuwalo.pdfIn PDF document text
- https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_2db65306691e4dc6bd5af552dac1d9af.pdf?index=trueIn PDF document text
- http://dexifuv.epizy.com/80705653206.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f5c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C6	5404 bytes
SHA-256: `a9532be748aff2a1ed8aa33c9837b737e18743797aab5a09d334acb2609e7304`
`font_01_sfnt_off00010824.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10824	10892 bytes
SHA-256: `e3faf1a5374b29d1a22c3af6dfc896247415f8b01b8ceabc0f3c7d7567538cfc`

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