Malicious PDF — malware analysis report

Static analysis result for SHA-256 16db4695d6f58f81…

MALICIOUS

PDF

83.7 KB Created: 2021-05-04 07:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd26216afed1089815d79afa6ae3d8e8 SHA-1: dbb1091b62ea86f189a67810055024c8cc2c1273 SHA-256: 16db4695d6f58f8170a418a74ffc4dfb344a98be2db7fb8d402389c652a5b883
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure suggests it is part of a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=frigidaire+stackable+washer+and+dryer+reviews In PDF document text
    • http://lalat.space/8112138784647xay.pdfIn PDF document text
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/bevizomuwe.pdfIn PDF document text
    • http://liko-sneakers.com/15962945641t8hn7.pdfIn PDF document text
    • http://aarbuz.space/sylvia_plath_contusionqs8b8.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/42b0c4.pdfIn PDF document text
    • http://idealica-italiaoficial.site/jufawetanugiv2k2j0.pdfIn PDF document text
    • http://hallop.xyz/how_to_learn_web_design_for_beginnersl5kio.pdfIn PDF document text
    • http://momenujobig.22web.org/building_an_android_library_tutorial.pdfIn PDF document text
    • https://suliwire.weebly.com/uploads/1/3/4/6/134650608/2320231.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/00a80b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/what_does_a_moca_score_mean.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_53d8aa11ebd544efa0a39a9a3dd83c07.pdf?index=trueIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_217ee39f3322450eac74902a9e00b008.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_eeeeea1fc6444f98aa3a4aab7ea229e9.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_fe2a74771a1f4b66b5039b1ac74e42f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanubili/what_is_a_dual_piston_caliper.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_0a8ab1de2da4417f9a92d78b4ac3a5dc.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_3d4ca827259947bd8269fef899610d0e.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_d82b03499ce546379682a7ecfc24edfd.pdf?index=trueIn PDF document text
    • http://nalakakowim.epizy.com/manuale_apicoltore.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_a82ccc9e8f6643fc98bf40eed77c5d13.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_91ba68593101474191a31be6d60848ee.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 5612 bytes
SHA-256: 9125d3e0af51ea04250542cbbcaf349d545ec81fca61a451f2cc1d2d6eeb2188
font_01_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 10816 bytes
SHA-256: e2949a3adb42dfbb924d38150a1e197e13ae195d28b0161d8a37989dff3eb8d0

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