Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ebea3d6ca061b0…

MALICIOUS

PDF

75.3 KB Created: 2020-12-19 17:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 566f3842006ca0771b63e1fbff9b4260 SHA-1: 0b68f96c05fb721c4fd1b0ebd9c79db87689ce27 SHA-256: 87ebea3d6ca061b0ad4faa4e4aade284a1c141d2140e4df441271141f25ef46e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to disposable hosting, indicating a potential link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafficel.ru/aws?utm_term=ag+grid+filter+date+format PDF link annotation
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/9952657.pdfIn PDF document text
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/dokoma.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_5fc51868e6a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fc7bc1e4dc86.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/2348730.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc676cd1452f90b7f0b47eb/t/5fcf0a7157846c5b834d5c26/1607404159493/xuvivavirazatarujenej.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/hydrates_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61b2085-070c-4b02-8386-20ca66bf16e6/31493481220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25fce09-0b2c-48eb-916c-ea0e5b80608e/legend_of_zelda_a_link_to_the_past_rom_hacks.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdd212af7678b7682a41454/1608327466103/bumakowifodokipunoxenifub.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/cause_and_effect_matrix_for_fire_alarm_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c11591-1cf7-43b2-ac1c-702000a8711d/80228073533.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d3ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD3CA 12880 bytes
SHA-256: 5f4e66fc0cf07925ed1ffa4273d8ef1c0a9eb964f63ca48e67ea0ae42015d682
font_00_sfnt_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 5036 bytes
SHA-256: a1127f1f045b5430d9559d47ea4dbc18e77ae9a858d4021056e8b5845fe42d04
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 11728 bytes
SHA-256: ebddf074f62100316bd1a3878e9d6020add7d3a114e8fd3806292382ad14b829

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