Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b5f315a5333d7…

MALICIOUS

PDF

81.7 KB Created: 2021-03-15 12:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2bed6a4adaefd4dee4839c8faf437be2 SHA-1: 5a3114e4bb5e44082d84c2b469122a9df9303b71 SHA-256: a77b5f315a5333d7f280458c2694ea3b8fbd3623e3d0333da6e83913ce5e6a96
116 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://baarspo.ru/123?utm_term=math+worksheets+multiplying+fractions+word+problems', is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and link farm suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/123?utm_term=math+worksheets+multiplying+fractions+word+problems PDF link annotation
    • https://cdn.sqhk.co/vizakifito/yichgwc/world_war_2_tank_battles.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/cHgeWsi/32582192800.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/rajogiwu.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/cations_e_anions.pdfIn PDF document text
    • https://cdn.sqhk.co/titolegun/dhchhij/qr_code_scanner_android_project_github.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_3a41068206a7441689428b38a4364644.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/22469363074.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_3159071a577c4cf98dbd70e4c619e105.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_b34d7523cfbb49debffebef77f19d54b.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_a1f18820d73343ed83c106f1f2e62c96.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_fe3d3e18f0824e62b50537688ada64bc.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_aa25e9e114cf4d47bbe3c4f30cbc836d.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_110258a25f7c4f298b9aa607249208a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/durgai_amman_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/peworuwatovelel.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/mp4_mobile_movies_bollywood_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/36212569665.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_f633f076b80f4aab8fc7220031477304.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 5972 bytes
SHA-256: 634b0402d4d6099fc7e6188dcdb12182158e0d4f38e781d30802f98427f11869
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 11948 bytes
SHA-256: ebe6cb7ac7d6dff6aedb687aba5f13f1f9367bea9907f98a5b38f1713d8b35ae
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 17200 bytes
SHA-256: 4cee967981d2307797cfd6487391d9de98f6b6d15f23533bb0bdc617b886aac4

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