Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc7d894eda67039…

MALICIOUS

PDF

97.9 KB Created: 2021-03-20 09:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5c87c63387dcfaabdeed020f52528a2e SHA-1: 00d069969d64f022877263fa489eae0a38274489 SHA-256: 0bc7d894eda670390bfdb35ad27e1e394a12eaf68181bac81e31cadcceb1effe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to 'golowaki.ru', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to translation, aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/123?utm_term=answer+traduire+anglais PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5ff516a03deb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_6038004fee26a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46d106b063.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/ic0JdUi/light_it_up_song_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_60089d0f5d812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fdf0a789571a.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/jdicJ4L/dragon_village_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_600ea20d740c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_ad3362a1a3364e61bfee06df0af8d1b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aa744f-4826-4e84-bcdc-91de9475df07/how_long_should_you_wait_to_change_transmission_fluid.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_85a461dcc8df47c6b69e3903756aba0b.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_c76969bdef944c37bd1980d61a1bedac.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_0b681ca775c24e65af82c3c0944599a6.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_dea25c28e4294bbf8a4762ed6b2bf00f.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_6bbf5e18d29c492a8765cc71c05cd372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4a467f-1b2b-48eb-8055-c8f5614ebc70/how_to_construct_latin_sentences.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://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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 8376 bytes
SHA-256: f2edafd2fc35ee7e58ab9d18b6ef4207a872e280e857bac19d5f3cc7c78989a3
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 5072 bytes
SHA-256: 518af42cac54a7bb8a56a0bf0182e8611ab4c25c9cbe8c1f8ca015f66dbf6f8a
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 8120 bytes
SHA-256: 979b1118c747f3b10525aca7c4326be024e6e0cb254c57e26d2286b91cdbf284
font_03_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 14552 bytes
SHA-256: 951ea87c7636c8ab6a54ece2db2e856fa9dd55b3661935cb02302c9f853558e7
font_04_sfnt_off00015f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3D 17104 bytes
SHA-256: 3c5b8b78081cddc51910d5de69b99d4b0b9cb4003af552e36a4c682972155ad9

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