Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc64e5bb338090de…

MALICIOUS

PDF

85.8 KB Created: 2021-04-05 13:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a536281b25e139db749980eb7213c7d3 SHA-1: 21f589995e0f58231d93e5b025f15d2881886b3a SHA-256: fc64e5bb338090decac7a242c6a52680ffd54d7d6d2e77f6616b1036f0a99469
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm. One of the primary links points to a URL with a search query, potentially for SEO manipulation or to direct users to specific content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=2011+jeep+grand+cherokee+service+4wd+system+reset PDF link annotation
    • http://papakofowomida.22web.org/al_quran_bangla_pronunciation.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/66c0cc12.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/9de7f0adf9.pdfIn PDF document text
    • https://pejijogukuto.weebly.com/uploads/1/3/4/7/134768892/5d9a3fb48371f6c.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/regereresex.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/xexugafu.pdfIn PDF document text
    • http://zapazereti.22web.org/cdl_practice_test_ny.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/dasixeza.pdfIn PDF document text
    • http://levitajagukog.scienceontheweb.net/5278976456.pdfIn PDF document text
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/fd27a4fbb.pdfIn PDF document text
    • https://ludivolufag.weebly.com/uploads/1/3/0/7/130739835/bd52aca.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/suselulabibarokew.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://uploads.strikinglycdn.com/files/3e8280ef-5f1d-4626-b41b-7cecfed67e72/75355267634.pdfIn PDF document text
    • http://wutivufugisev.epizy.com/archicad_gsm_objects_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c8e8e3-8109-4d14-a33c-63c93577315a/rotefovatezixuz.pdfIn PDF document text
    • http://sofopemesojume.epizy.com/sajerazotogowoxirekiju.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/marvel_movies_2019_in_tamil.pdfIn PDF document text
    • http://sopigovo.rf.gd/lobofexazigonipi.pdfIn PDF document text
    • http://ninamivekadod.epizy.com/attestation_assedic_assistant_maternelle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ca9e0c-78cb-4bb2-916e-6b5f9a285d9e/93494506071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ce5155-b20c-4c3e-b0eb-27077831faa7/slimpar_56_battery.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_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 5956 bytes
SHA-256: d8cbcac1cf9189897ca4c4643dc1bd3ba241b53b3b8852771ec3a3ea28e8f8c2
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 10376 bytes
SHA-256: 74aeb91bfbdf4f5f90f5ad07c985e4681fdbe77e20d98d313ec1d71aba239a61
font_02_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c