Malicious PDF — malware analysis report

Static analysis result for SHA-256 446de9a49215cd74…

MALICIOUS

PDF

81.0 KB Created: 2021-03-29 13:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e029ec84d7c96b15bfd9f8dca86447b1 SHA-1: 95edb8628e5d5bf07d798c08e3d7dc4ac0bce313 SHA-256: 446de9a49215cd74ec8e7801cffcf1eb6921dd19ad5ddedf4b01a337acf5a1ad
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, which aligns with the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=byomkesh+bakshi+series PDF link annotation
    • https://cdn.sqhk.co/fujigugi/YI7jakQ/linear_pair_angles_definition.pdfIn PDF document text
    • https://kuzuvofaneze.weebly.com/uploads/1/3/5/3/135394893/dezanedula.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/chhgLqS/4765832636.pdfIn PDF document text
    • https://cdn.sqhk.co/nokodexuxof/Lhgizg5/greatest_rock_songs_of_the_90s_and_2000s.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/6211998.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/jLRjfO6/digubozovomowid.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/3d77a.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/salijepamasor.pdfIn PDF document text
    • https://cdn.sqhk.co/purijiralug/gcjjhax/gosai_baganer_bhoot.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/MSdgixU/amazon_sellers_account_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_1ef7245b9a194dbcb566491852dd2af8.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_fff8265a971643f398eafb292545b7d6.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_10053c5e8f124add912e4085392a8885.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6312a8e8-b121-4135-a587-386362af8fa9/dymo_letratag_cutter_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8981f2d-8695-4204-ad79-366096504eb7/xupeg.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_e0718262328d413e9809c201622c799e.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_2ea6ce3bd3414168a239c467b4be8d66.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_03162d2b4dfe48ad9ca74232a95e66b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1faa9047-604a-4c6f-8f56-b5bd0141bb9b/58329824176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2b27cc-5210-468d-b8b1-c636335002c2/50356900817.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_19513ebf61194edd9d1e4ed720da3dbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b40ea9b-e0da-4361-a014-952d629500c5/how_to_use_ifit_activation_code.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 5248 bytes
SHA-256: 2b37482d226d649ac48b00f1d79219793994f3c51805f6a3cd6fae1d20a07038
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 5072 bytes
SHA-256: 3c5d07cf14bea0363d9729d6239faafe1387ee5d3a2828789fc8aa5832ca4dc0
font_02_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 10860 bytes
SHA-256: f636fcc588eb7749aedb9c5fe965bdb28978d48ca8e69654695bd3c193d73e3e

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