Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a17bb6615ef85…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 09:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ef74fe120e210306f6c2ba290d5c502a SHA-1: ad1c54ca77055a78d00bd6cf2c1aa49ee302af4a SHA-256: 7b5a17bb6615ef8537bb8d63c50e1986aa9891c3ecaa85391c3ca39522829d19
194 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 phishing operation. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/award?keyword=bartender+cv+pdf PDF link annotation
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/7664803.pdfIn PDF document text
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/kipuxusarapex-jisaz-bisude.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/bhcpif1/z_nation_season_5_full_cast.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/5d11284c006a3.pdfIn PDF document text
    • http://organize.shop/bass_guitar_tab_templateykhss.pdfIn PDF document text
    • https://doparobisupof.weebly.com/uploads/1/3/5/3/135329684/pepawadewum.pdfIn PDF document text
    • http://sallles.ru/dopizidajalikalw5u9b.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/7788991.pdfIn PDF document text
    • http://tehnotop.site/fuzisokukapamuba6b74d.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/hhxhhND/bright_eyes_dog_training.pdfIn PDF document text
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/denoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_2bb818f5963341b2a8f0d19c958a739a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbac7193-bcc7-446b-b200-16f454339b95/493906521.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_00d269cef308447f80974e1c2556bd04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/271c6fcc-3524-4c4b-9288-afb4a0f4d059/russian_grammar_structure.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_535c769eab0c4f6b9459280910ea50db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12244982-8295-4129-b640-ce536037f2ce/69339042110.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_0bf4639d48b64535bca176b4af27bf8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2a45b2-e052-479d-b262-97f5c62fac43/fanifudor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64aa8b9d-4da4-427e-bead-d1e8109a0d62/xorogotemigurojujupose.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_35190993dff14467a9ac1ca997a430a2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 5048 bytes
SHA-256: 1c740d0678e151107df129450109c8285d1ad67e0f12d1c7783a15e0c7dfc1dc
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 10504 bytes
SHA-256: 35221b026f8b2615d081e16b114ec656f5a2571ce224b244cdbadaae3ae5d03c

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