Malicious PDF — malware analysis report

Static analysis result for SHA-256 f810a753a294b637…

MALICIOUS

PDF

93.4 KB Created: 2021-03-06 02:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4fe30cec5087c645d83c34565ef7df71 SHA-1: 994bd82d66186217a1c4cefa71b7a7dca4db9538 SHA-256: f810a753a294b63766319500f718f095314f29292146b93320f92c20773ce810
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://midufefew.ru/123?utm_term=30+para+surah+inshiqaq PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449402/normal_603218b568ebe.pdfIn PDF document text
    • http://ferejupaxebul.iblogger.org/82085913394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_603a4eb4efee9.pdfIn PDF document text
    • http://kiruvoxexuk.iblogger.org/drill_bit_sizes_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5fdd38fcc19f7.pdfIn PDF document text
    • http://nuxutezupinel.22web.org/chevy_malibu_lt_2011_manual.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://s3.amazonaws.com/xeponodij/79538644668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f186b00-3657-4842-9725-602f43c83178/98181456123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dcc198c-f305-41e0-b644-c7796c13adbd/xamozirakenamebetixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edb52d3-a3fe-4ca2-8e65-ff7273b2838b/behold_our_god_guitar_chords_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6352e02d-169e-48bb-8476-859c4d364225/vujumodogemekibev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a48e122-eb75-46df-8ab0-756ed9660490/black_sesame_ice_cream_recipe_thermomix.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/scratch_apk_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25361670-b60c-4c4c-a44c-2864a3e4cd81/how_to_use_adobe_acrobat_pro_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a495ae-f5a7-44dc-ad7b-bf390b1013be/steelheart_brandon_sanderson_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9081dd17-806a-4777-b2bf-3c7dc7dea7ae/nurefozizuvixojidazup.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/japanozas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97caca7-6da1-49b0-93e7-60a170569498/bevajofasiluwuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604cde7b-e350-4b89-ba0f-36185f71dc43/49379056704.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fa3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA3D 10036 bytes
SHA-256: 2e656cf4097c8f186ffd9c8357260dad7f608af436464f9a7cc9188935124f2c
stream_005_off0001385e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1385E 26840 bytes
SHA-256: 862a44f3e3045a0dd432aab12414c0641dac35ed0e2fade7a6e4c684dda0be00
font_00_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5212 bytes
SHA-256: 164b8b5b5b5811a26b830ff89e93d473e1e94feed911c19a3ffc560aa69839bc
font_02_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 9884 bytes
SHA-256: 40d8a9d6680d691158901c2e9ebf562e56523f3f73a21472b9814a3cf3245d66