Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8bb3347b0de120…

MALICIOUS

PDF

75.3 KB Created: 2021-06-07 04:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa379e9d0f9752732d256278aba6288b SHA-1: 92fb20c670860c9b3ee65232ed04cbd0bd792080 SHA-256: 8e8bb3347b0de12003b28e67c068fa19b3b5ec7c7b2aebadaf005bebc8f974b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://philabc.ru/pbw?utm_term=what+is+vroom%2527s+expectancy+theory+of+motivation', appears to be a lure. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users, potentially to phishing sites or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=what+is+vroom%2527s+expectancy+theory+of+motivation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425759/normal_60469475da562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_603bd5458d5c6.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/eaf7260.pdfIn PDF document text
    • https://gelokiranik.weebly.com/uploads/1/3/4/3/134330064/6872459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_60bd758a16875.pdfIn PDF document text
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/5910029.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368758/normal_60b72fe543637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6031e1c33b3f4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427523/normal_60b759d75f1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_60415d6b48635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_6028f653db3d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_605bb4296cb4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1d9416-1294-43f2-ad63-f8e026177df3/is_touch_free_or_soft_touch_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6059b04c-6107-456b-8bac-83b50d879b58/93503889316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e6790f-1e57-4cdc-8d55-a8145e29de50/how_to_describe_the_stars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ff0863-048a-41b3-82d3-ab84cea77ef5/ubiquiti_loco_m2_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38430de0-07b4-46da-b076-486fd821953e/klipsch_promedia_gmx_a-2.1_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90366c9-a6a5-4a90-82fc-ffcbc73fa01d/fumiwozobenupizofizowegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ebc576-41d6-4140-b0dd-d58a0cdcae29/zipazasifazupugulojawolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e101bc5a-d4a1-47ef-9298-14b2f35efc50/dalewepibalisonigiromopuz.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5500 bytes
SHA-256: d00f62a353e3e01b17272ede7e3ba2944941e1199e31a76aabf7b457e4aff913
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10816 bytes
SHA-256: 87b5838186e1d9da940f9ad869759e0eebeafb0ba09c34ddf0a34ef15980fae3

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