PDF malware analysis — malicious · 67ef553a54847074

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 07:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: d7ad6d4410e755433eca61559eed41b8 SHA-1: 5f9f970ddfcbcfe60ae64c9cfef47f2f191d324e SHA-256: 67ef553a54847074662a65f35acfd6a9e77047fd7cd840cc29d24018f76a4d46

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or unknown domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'compound statement calculator' and 'wkhtmltopdf', hinting at a deceptive pretext to drive users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

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 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://botokaw.ru/wix?keyword=compound+statement+calculator PDF link annotation
- https://cdn.sqhk.co/nalawanuxa/cjj3ggr/fall_guys_ps4_free_not_working.pdfIn PDF document text
- http://onesmall.space/fancy_names_for_chocolate_dessertsr9ct9.pdfIn PDF document text
- https://cdn.sqhk.co/kapipota/hiY1Xjg/red_roses_meaning.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456165/normal_603610b18357b.pdfIn PDF document text
- http://itash.space/31188660971sdl2j.pdfIn PDF document text
- http://itdiscounts.info/febuzabmdxq.pdfIn PDF document text
- https://cdn.sqhk.co/fekepazerox/fghiidv/special_warfare_magazine.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480750/normal_603a65aa0c720.pdfIn PDF document text
- https://cdn.sqhk.co/seponidozit/highjhj/10_easy_skateboard_tricks_for_beginners.pdfIn PDF document text
- https://cdn.sqhk.co/xamitarerivu/5Bq7Uji/call_of_zombies_y8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455197/normal_605d71c416b27.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392877/normal_6008b4bc2fcd5.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/zumezeviwakiz/david_ludwig_always_hungry.pdfIn PDF document text
- https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_466fe975e67f4692a8ac16752e1f94da.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/desenaz/antietam_battlefield_tour_guides.pdfIn PDF document text
- https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_7b46a263d5864d45b995bc2d04a70b7d.pdf?index=trueIn PDF document text
- https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_fbd5f8c7e343461c81e6fd6c88aa253c.pdf?index=trueIn PDF document text
- https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_e5f28d554e874cca99e65475910585d4.pdf?index=trueIn PDF document text
- https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_3002f7a56b944ecc901cb8f7b34ee1c3.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zalomi/oracle_11g_installation_guide_linux_64_bit.pdfIn PDF document text
- https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_d0287a4c66f841e4bbed5daf7a051ce2.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_off0000eac9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC9	5076 bytes
SHA-256: `d64c2b2e01ad1d43d0ee25044815dcef301a0e603ef438826c825dce9c7a1e90`
`font_01_sfnt_off0000fbee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBEE	10688 bytes
SHA-256: `ec026f348216c86ca9db3c73780b98c265eb387d53ebcfc3efa1a4c6952f9e0d`
`font_02_sfnt_off000120b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120B4	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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