Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fa9cf32bed879f…

MALICIOUS

PDF

80.8 KB Created: 2021-05-10 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cdc78233edd44464ced8a8ed6158067 SHA-1: c6bb1a6081da02327d586c8ca5d3e614af811a9c SHA-256: 90fa9cf32bed879f81f47bcb3d4dd96820cd47bfdf2ec7bbbaf98c26d3950823
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to biblical studies, likely to attract search engine traffic and direct users to malicious or spam 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://pelibifir.ru/strik?utm_term=que+es+el+desanimo+estudio+biblico PDF link annotation
    • https://cdn.sqhk.co/xojelumegasi/ecIgfgg/tebuvazujaba.pdfIn PDF document text
    • http://shtangye.xyz/skf_wheel_bearing_catalog32ztq.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/ibjcrgj/textra_sms_apk_old_version.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/xopezufiboledoxuritob3xsnh.pdfIn PDF document text
    • http://creditactive.info/the_lottery_winner_book_reviewl1eb9.pdfIn PDF document text
    • http://stakingyfi.com/katakebopuwazisesojgx8pj.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/24dbd58.pdfIn PDF document text
    • http://sberbank.link/buleboxamewusuzewezozuwk1lts.pdfIn PDF document text
    • http://mishabelle.ru/77177965058n7api.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/samimapelaka_xoratagu_zerepujipaf_jakegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiluwemejibe.rf.gd/929741811.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_2b7f7810c64d4a8387029547b7f0870b.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_c74df17b683a491ab3a89f9b16e85384.pdf?index=trueIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_181134929eab4735a052af78703d329c.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_b2931b374ceb44838bf098231c5abe69.pdf?index=trueIn PDF document text
    • http://sajififavaw.epizy.com/53609321370.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_04a4f9084c4347cab9161d95468b6c2a.pdf?index=trueIn PDF document text
    • http://zepitomus.rf.gd/nixirazab.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.

FilenameKindSourceSize
font_00_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 5188 bytes
SHA-256: 630cd7712595cdec4676919cc94ee9fee59959b2268fa77cb674cd0b6558721b
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 12832 bytes
SHA-256: 700c0ffe255dd9871132e77c06135558655dc794911feb179a26734b065b3ccf

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