Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb35111854a3ed59…

MALICIOUS

PDF

70.6 KB Created: 2021-03-07 15:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01a3c4fae10f98fa52bc1894d357ad2a SHA-1: eca7734b73561afd2e8a3ca3618660fb8cc3d99d SHA-256: fb35111854a3ed597380e253ed2042b790cde3fbbcb3cb95808c3d08cd8153c1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

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://jumiwimov.ru/wix?keyword=petsafe+wireless+fence+manual+pif+275 PDF link annotation
    • http://nabavawuzafurur.mygamesonline.org/baxuvatiromaxapugenegil.pdfIn PDF document text
    • http://doporujela.iblogger.org/tropical_house_2019.pdfIn PDF document text
    • http://dududuw.mypressonline.com/rebecca_by_daphne_du_maurier_full_audiobook_free.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/how_to_critique_actor_in_a_plays_hagrid.pdfIn PDF document text
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/7d0cc.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/5544e.pdfIn PDF document text
    • https://walagikolisof.weebly.com/uploads/1/3/4/4/134494282/ed0d4226.pdfIn PDF document text
    • http://papotupeti.iblogger.org/odia_movie_song_dj.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/fabisabumevamopo.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/00014edf.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/cc6fcd1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_29b58ab2bc854af18c394872f369b78e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d843447-f39a-42a5-910e-91cf578af2b1/28706256799.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_967b6d6b67f74ebfb28fed6bb39fb169.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15905a1-2b4f-4404-b261-8320ba798d68/kupalupetibikir.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/fosaxosivovefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d780b534-8d08-41ae-80e1-b9839b5a3fbc/how_many_stock_symbols_are_there.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_b5690718744147f08c71a9d2fe3e2eaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00424701-9619-481e-9cf2-a7b4cd84a1ef/is_red_rising_worth_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c6907f-d8a5-4b7b-9c4d-f82d92525d1b/31797677676.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/platform_9_3_4_printable_ticket.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/tazarewarirefotemado.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 5592 bytes
SHA-256: 50110c599d11b591c8b8cc6ba0ac6574410d3a061c12826e532516359d183a26
font_01_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 10756 bytes
SHA-256: 8b61636be632b6b983278d627815747549bcc5150bad6f421112d97559817d5f