Malicious PDF — malware analysis report

Static analysis result for SHA-256 3599fe22cc1350c1…

MALICIOUS

PDF

82.8 KB Created: 2021-04-21 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff41aeb56f941ed683e1600e94626508 SHA-1: 623737a692af6e78c0255e2330a5eed88b78b420 SHA-256: 3599fe22cc1350c139c8bb0bd57b276223bb796ca751878ab20e2d14449a820e
184 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics, including a critical finding for a redirector link to known malicious infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains text that appears to be a lure for a product, likely to direct users to malicious sites. The presence of numerous embedded URLs, including one pointing to a known malicious redirector, strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=rival+meat+slicer+1030v%252F4 In PDF document text
    • https://cdn.sqhk.co/bamebuxi/hgjdJnn/rezadarezeziguv.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/faxuvowuzamis-fepupaluw-wijok.pdfIn PDF document text
    • http://drnextact.xyz/frida_ios_memory_dumplimj6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fcff51e2907c.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/zasurepawinozezasu.pdfIn PDF document text
    • http://hermidkovo.info/what_are_the_purposes_of_lawsyki0w.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/edk5NgN/wigodosofugufizisaj.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/zevumepaboxawun-dibedirovaraz-faxupajegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_60291f25ec070.pdfIn PDF document text
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/tatolisevef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5fff69eb2e5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_600dba2e236a8.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/55adb41d9b51.pdfIn PDF document text
    • http://my-favshopd.online/g1w_dash_cam_firmware2i1nh.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/shfgchg/61003652229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_601f7b649f2ff.pdfIn PDF document text
    • http://superheatbelt.xyz/application_for_leave_formal_letternbx3e.pdfIn PDF document text
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/787874b2cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/mikavuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/lovurevix.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/jakelasowozuka.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/university_botany_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/dance_video_hip_hop_mp4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 5496 bytes
SHA-256: 46f1a816e6f19f092f269c4b6cb1142c4f714721a2cc0b998fe31712b0566fae
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 12500 bytes
SHA-256: d9363af22d655ece6e460d8982ec78bf714b8d1d0f6446bf2708f3ca00a67f62
font_02_sfnt_off00012855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 16172 bytes
SHA-256: 778407b9b44ba78af3e41f271f922c8e1d1db5cf1ff960098081db59965da639