Malicious PDF — malware analysis report

Static analysis result for SHA-256 674a2188dd28eb3e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 07:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b557a7ad1826cd75f8db6e567c92971c SHA-1: 12968ffd7ae4054d283cab886c4b8aec850eb3bb SHA-256: 674a2188dd28eb3eb5b06080a6118f61d60cd30eee0e4c3e02147c51d43e4be9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it may be used to distribute phishing content or exploit vulnerabilities. The presence of numerous external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

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://jottigo.ru/wix?keyword=mision+de+una+tienda+de+ropa+para+bebes PDF link annotation
    • https://guwamiludakubor.weebly.com/uploads/1/3/1/4/131453222/pugelorofewikiromo.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/bipipobukupumigutewuriro.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/fidizedefamilabikat.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/16478741215.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/nemajufujus.pdfIn PDF document text
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/3500630.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/quran_arabic_madina.pdfIn PDF document text
    • https://finepeva.weebly.com/uploads/1/3/5/3/135347337/4956879.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/xozonenelo_gorubel_laparaxegi_benuvirubeluko.pdfIn PDF document text
    • https://taborufizuxedo.weebly.com/uploads/1/3/5/4/135400835/229082.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/79482f0584286fc.pdfIn PDF document text
    • https://nelejezubifub.weebly.com/uploads/1/3/1/4/131406077/45e3b57567d4.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/jiwisi/alien_skin_plugin_photoshop.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/bissell_powerforce_compact_belt_size.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/convert_to_word_software_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/shortage_occupation_list_uk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e8ace4-c1b7-471d-a090-be12874bbbec/how_to_turn_on_a_yeti_microphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc410e0-c645-429c-9287-034e05cf9cf3/33115214250.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 5068 bytes
SHA-256: 586bc17d472554f7d9899e8941ec4da5b298868df17ac210b7f8adb24c56b12a
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 3164 bytes
SHA-256: a6f8778571557fe8762d86164bb6f1990bfdc78432087c3157ee8c4e02d8e3f3
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 11452 bytes
SHA-256: 9f9f4adb29ab53dc7c5a5661b731436ed52716255ed677ed89c160a68fa7cef8