Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb99b55986c499c…

MALICIOUS

PDF

71.5 KB Created: 2021-04-05 02:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76f918b5a86112c8b0febde2fda5a191 SHA-1: d68ca6817e8600a4d85282d8e8e5c72ccb2c217a SHA-256: fbb99b55986c499cbafbeffe13cd715c16122adaf86222a3f6e27b2ae9929454
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with at least one identified as pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is a link farm on disposable hosting, designed to redirect users to potentially harmful sites. While no scripts were extracted, the presence of many URLs and the ML classifier's high confidence suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://crophysi.ru/strik?utm_term=sas+ods+rtf+style+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_60599464488bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373016/normal_600522d833994.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/hbih02P/tomoloo_hoverboard_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_606a4390a35f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5ff3b69b65467.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/6igJ0Hh/93201076541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459935/normal_6004dd95161c0.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/kcxjjgj/jejazejufajogef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6035352ac867a.pdfIn PDF document text
    • http://pc-remont.website/damodar_gujarati_econometrics_by_examplegwwcy.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/XijxiiN/jetod.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/robin_hood_2018_cast_namezy6xn.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/duwutukuvobubotuwebifoxiq819.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/vhgoQja/grade_12_english_study_guide.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/jizubisetebof/3sixt_action_camera_1080p_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/common_snapping_turtle_care_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/khaki_short_sleeve_uniform_shirt.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_3298d5738466470e8af340cfdf33ed34.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_53fd80c19ed24545adc14efae15d9235.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_abad96046d6040f4a66c239275d1a8a2.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_8394078a979e4d75bb1b8194068ff86e.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.

FilenameKindSourceSize
font_00_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 4788 bytes
SHA-256: 999f80dc7aac26f7b694aad49e8d22c735d9352392fdc845bac257e1589445c0
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 11652 bytes
SHA-256: 263c4761ea0a0360a441fec73f7d95f344138e9ec0b34ac933aa9c7ab199c436
font_02_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f