Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1015b495bc419e1…

MALICIOUS

PDF

69.3 KB Created: 2021-05-13 03:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a49d0cd67b9cdf537791ff1703b99720 SHA-1: bb21649328756b8ce9921614b52ec19d9af7e523 SHA-256: c1015b495bc419e1fbe2821801a322200e5c0e2f99672216e1078ca691eea03e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing operation. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. No scripts were extracted, but the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://baarspo.ru/strik?utm_term=is+d%2527link+dsl-2750b+nbn+compatible PDF link annotation
    • http://litesunaju.iblogger.org/myth_adventures_volume_1.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/bBhiwXZ/paper._io_46_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/2XIiaii/coniugazione_del_verbo_avvertire_in_forma_passiva.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/id6dZhf/lokofinedasaw.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/eb69cb16.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/bd8ed.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/bin_sachivalay_model_paper_set.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/hXughrR/10469450317.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/ihVhii0/xabudavasiwepefu.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/66931399037.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/uterine_fibroids_and_pregnancy.pdfIn PDF document text
    • http://goxutasabadatum.sportsontheweb.net/fugit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.pdfIn PDF document text
    • http://jipinasin.epizy.com/45041090802.pdfIn PDF document text
    • http://xemenorusameker.epizy.com/dutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eff592-f922-415e-8cc3-8d1d8f41d919/epson_workforce_7510_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525efaab-12ff-48b0-9136-13960f2e4a8d/it_a_nice_dream_lyrics.pdfIn PDF document text
    • http://lagexetese.epizy.com/15040080944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caceb39a-c17b-4e14-8aff-b2d7148dcb9c/bejiraxujowagedi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 5808 bytes
SHA-256: 1726f68e945b110b20865aa5d7427711529a9650bdbc06602805d509bb44b1d9
font_01_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 10216 bytes
SHA-256: 5172557dcb439de87179eb7fbae6655b273cb700edcf5284503d7dec5e7ccb00

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