Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d9503cf420fb8b…

MALICIOUS

PDF

69.0 KB Created: 2021-02-25 18:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a28a71f0bd713116b014036e138db437 SHA-1: 0c19138b60c40e56fd894bc910aa62de0103b61f SHA-256: b1d9503cf420fb8b8e24a9af44ccee0072e0fbd08b9e6721f47bf0d1f577ba34
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate documents but redirect to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru', indicating a phishing or malware distribution attempt. The 'PDF_SEO_LINK_FARM' heuristic further suggests a tactic to generate traffic or distribute malicious content through a large number of links. No scripts were extracted, but the embedded links are sufficient to indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://yafferge.ru/123?utm_term=why+are+some+energy+sources+more+reliable+than+others In PDF document text
    • https://cdn.sqhk.co/rupomotiz/wqgc2Az/maze_runner_4_movie_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/vhrbhbZ/dropwizard_metrics_custom_reporter.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/ralan.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/gfhaigN/91764727451.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/ovjcahf/33422847524.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/icRNhaC/zulilavitigotawozutaso.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/jjjeifV/modern_warfare_warzone_map_secrets.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/75F81ji/mawepavugugokuvasorow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rufonali/vesir.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/xepegovepa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/sobife.pdfIn PDF document text
    • http://wofukisunoxo.epizy.com/linux_essentials_midterm_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/6350963130.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/bosch_axxis_washing_machine_not_draining.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/assassin_s_creed_unity_apk_for_android.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 5348 bytes
SHA-256: 8057372d0e62b2ad8e720ed424308d5f99deeb80a4c63dcc70bbc692acc304cf
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 9576 bytes
SHA-256: b18c68b639eeb1ea7cb8e1664a0e5d4a8a0016cdb397f7c3a8c8b86149e00ed9
font_02_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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