Malicious PDF — malware analysis report

Static analysis result for SHA-256 90be1eaf37c00ce8…

MALICIOUS

PDF

72.0 KB Created: 2020-12-17 23:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e9c95f141715a3206251c6e02a264f77 SHA-1: 96cba35c62b3de7c87b75621b086dc64bde42b85 SHA-256: 90be1eaf37c00ce829b2fcd5721cf1762124e91ef9e6631f528f9230e554a2f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/strik?utm_term=sustainable+development+technology+canada+linkedin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f93820bc6d49.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/4cb4335d.pdfIn PDF document text
    • https://fibarodisoti.weebly.com/uploads/1/3/4/5/134594602/gaxise_liretiwozariro_jovowulowefar_mexikipa.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/xizakewamapejil-kunidavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_5f9f417a89ad1.pdfIn PDF document text
    • https://gexupiru.weebly.com/uploads/1/3/4/5/134576942/a14ad.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/wafisifexi.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/bilozox.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/daraniwekamidir/sg5010_servo_motor_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cf2bb5-21e6-4a94-a00e-af43903556b2/distribucion_de_probabilidad_discreta_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf986904-9802-4529-912f-7ff98f514657/82469268544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde26494-8085-4ce8-a48a-cd80897a039d/33673280822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af819f8-43f7-4520-87d1-58d66eaa96d6/43988045384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf6dff1-5f96-4a4c-9690-bfa2b387ed97/70257145205.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_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 5744 bytes
SHA-256: d5d543eacb9978a4d9bd5d9ee28d836d50dbe1f7864a7f0777d2a598a8ed584d
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 10304 bytes
SHA-256: d4177e2ee1d44ac5c3e9bd7ad56db91b1301688e43501b33ec77679b7a8abc05
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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