Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8c0aeeada314dd…

MALICIOUS

PDF

90.7 KB Created: 2021-05-21 12:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2bcee5cdf473b594b9e8fe537251a2b9 SHA-1: 53c1348427482d06256df54beb6ac61b08efa190 SHA-256: aa8c0aeeada314dd10978efb5b43c33fa76c68b1d77ce9ff3c127a7f639fdf23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary external URI points to a suspicious domain, likely intended to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=movimiento+rectil%25C3%25ADneo+uniforme+acelerado+ejemplos+de+la+vida+cotidiana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490256/normal_603eeb964c3fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcef34a8c6a6.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/rapamedivoxifa-tinutozomugop-fajuriga-duxapebo.pdfIn PDF document text
    • https://resezavurafufok.weebly.com/uploads/1/3/1/4/131407395/kewunudewuzixor_juxono_kapagideribejo.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/e51a5.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/1a1e310494d3812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_60562d37f1826.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/f403b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_602874b669854.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/kijelopazekune/dreams_fleetwood_mac_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a20010-06b4-46b0-a453-2f6199bed671/75154505440.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/94092416819.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/my_rca_tablet_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/gunbound_high_angle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/nufobereg.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/74318989032.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/56718301789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5bc77d-573e-47c1-a1ef-80ae0db82f17/lodizunikuvodijifi.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/windows_10_cheat_engine.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 5376 bytes
SHA-256: 555116398c25f5b67bc2f3149c4dcbf44bc06a6b00a27753b08dd1aa7c77d8ef
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 12640 bytes
SHA-256: c551896cf836a422f4db632dd943e569d5686fee7ee2875cd6a8421d79147194
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
font_03_sfnt_off00014b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B87 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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