Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9b0e7d25ad0493…

MALICIOUS

PDF

76.2 KB Created: 2021-02-20 18:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c6a6f86fec80aa4b36d0df646c106391 SHA-1: 2d5b4e5d785215f01ee08bb2c9ccecfe04cb4530 SHA-256: aa9b0e7d25ad0493db9ae7a9d307f87f896af81d580414a59fa56fe70f6202bc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a potential link farm or phishing lure. The primary URL observed is https://crophysi.ru/123?utm_term=how+do+we+measure+leadership+effectiveness, which is likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://crophysi.ru/123?utm_term=how+do+we+measure+leadership+effectiveness PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5febedf877071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_601bdf1d2c795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_602d67925dc0f.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/nivonobujeketo-fepor-pixugeg.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/6044142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd915a83bb0e.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/muvezekijewep-rekajegenix-saruvazezowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ff88c38b9ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd6568952160.pdfIn PDF document text
    • http://tumbochka.space/princess_belle_coloring_sheets91kw2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff0ec9e0368d.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/xefezesebusu/kenmore_elite_oven_broiler_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/autodesk_sketchbook_pro_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/sazebupazerujamivazowa.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/how_to_change_oil_in_generac_22kw_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/baraat_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/44185273172.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 5508 bytes
SHA-256: 1bcc20cc7a630c4f4b780ce739b751aacb8e54a6f845aaff487dcbc154463e7d
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 11124 bytes
SHA-256: 0b07d1bbe1f13f0655aa007b009db223d1780eac83fdcc8a9f5b2290b08e6a1a

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