Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746b320117069dc…

MALICIOUS

PDF

79.5 KB Created: 2021-05-23 08:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc16f1e568216c2aa306aa3050efedd4 SHA-1: 20744ba3689c87413ac59f9c746aeca128dcc0d7 SHA-256: a746b320117069dc468eed31090a5c0b536ffc7937fecad6e876bd52c2ac0bea
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services like Weebly, suggesting a link farm or phishing operation. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to a known malicious redirector, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to 'highway engineering' to mask the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=types+of+vertical+curves+in+highway+engineering In PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/ruvibezatabonu.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/3287182.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/rapodumuneveso-xizeguxefoz-bazumun-bezoruwev.pdfIn PDF document text
    • https://jitojadafolad.weebly.com/uploads/1/3/4/4/134404030/252e0776a290457.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5ffd9a8209c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6066d20e5ae3f.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/887702.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/busixopulavosumawil.pdfIn PDF document text
    • https://lesidodulutenem.weebly.com/uploads/1/3/4/3/134352412/22e7e8.pdfIn PDF document text
    • https://fubofekibodubeb.weebly.com/uploads/1/3/4/4/134483790/3a3de010e.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/samowepo.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/lazajo.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/sumesawoxajew/burner_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abab68a-bb94-447f-b96f-a026ad5927ad/is_it_love_drogo_walkthrough_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe1ad20-76e3-439b-b64a-fc8b9d3c88b1/is_social_media_research_primary_or_secondary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c39501c-395b-49cf-aaec-423d7dd10ec9/rinnai_sensei_ru199in_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/banuzesizewalowezitejon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca95f000-2922-43e2-871d-fb93dcce26e5/monitor_cardiaco_atrio_hc008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0fea08-51d7-4f9f-a9ed-dc75153550d6/how_to_replace_kitchenaid_mixer_gear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999566e4-cf9a-47cc-bc1e-ef628e2157f7/vudizetevazitej.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5360 bytes
SHA-256: 9a95a062c13742396ed6083bdb7a31689c807f74ea70dc59c0bd2bd8199dc5c1
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 11764 bytes
SHA-256: fe6cc177abe164bd8638da7965bd84d183c7d4f2423a3f50f2568d7a30a85fa1
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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