Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0155554c43fcbbd…

MALICIOUS

PDF

106.5 KB Created: 2021-04-05 23:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 754ea0df12aaba54d010c42b959dffc0 SHA-1: 3ee83882ed41e42cda9f396cc81903d96d0d15df SHA-256: a0155554c43fcbbd359cbd938a49423f4e95c6c5504cde8d44fc476a42a8699a
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to contain keywords related to game reviews, suggesting a lure to attract user clicks.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=assassin%2527+s+creed+revelations+game+informer+review In PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/6831939.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/1399963.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/zuxamefovulop.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/8808265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_6033c5d25a887.pdfIn PDF document text
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/gozil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_6018be7a6bfe0.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/falevi/hacksaw_ridge_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/blizzard_overwatch_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304f3e85-5b85-43a9-a05a-aab9a0a54c5f/tuder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bed1661-aba4-4aae-9fa8-f40d57133187/robinair_34788ni_high_pressure_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/bookkeeping_and_basic_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/venekigijurunofazamuvik.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/tobozajapavax.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/74090658122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d1567f-39c3-4a31-9b32-55a149d3f8b4/el_rapto_de_la_bella_durmiente_resea.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_off00016194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16194 5516 bytes
SHA-256: ea4332ed8306f8ecb5c7c46d551d343ccca7a1d9f152e14e818e02ac57dbb90f
font_01_sfnt_off00017459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17459 12184 bytes
SHA-256: 44dc220b675303f72fc0b90f7d739b0aa7331cd4f3f4a95415f4297239206871

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