Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2b3a563058c065…

MALICIOUS

PDF

83.7 KB Created: 2021-03-24 03:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ad42129ab11fe709fdd5e34b5e2dea4 SHA-1: 202ea7c169b5d18088cf9e89b6ba7ed8c60ead04 SHA-256: 3f2b3a563058c065d52c4071022cdfdba733d124f49d6ea5625c24225db0d93c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://bologen.ru/award?keyword=advanced+core+strengthening+exercises+pdf', suggests a lure to disguise the malicious intent. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and link farm activity strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=advanced+core+strengthening+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/dexasubu/hc6gitL/kilolaronubetepuk.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/hjfigS1/44126772681.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/how_to_get_mp3_on_iphone_11.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/the_tibetan_book_of_living_and_dying_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/Cigsiir/drive_in_nyc.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/non_functional_requirements_examples.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/what_order_do_i_read_the_star_wars_books_in.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/vuforewebub/best_1080p_movies_site.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/89534872633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1e7c2c-df39-4da4-b03a-36b1735f718e/23627491257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880146f7-0b90-4ed2-98f6-6198e73e7c67/how_do_i_sync_my_soundbar_to_my_vizio_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95de801-277e-4aa5-abac-b7fa0587e52a/how_to_replace_2011_malibu_headlight_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83783e74-b8f0-434e-968a-54fd77f88232/alexander_the_great_movie_in_tamil_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c790d8-751b-4790-9b9b-b1c6a37a2e9c/kojuguboruboxatoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/duravit_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d9a515-326a-4cf0-9143-4c2761ab00dd/vepadakusi.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_dd3a85c0350c4080a0e901c54473903f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae975fe-9eac-442c-831c-ffee45d72e25/why_is_my_sharp_aquos_tv_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2246d06-82bf-40ee-a6b3-23cbac231aa3/xuxebizewujevubot.pdfIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_48d400ceec704c9cbeb8e20cdf9dbd7b.pdf?index=trueIn PDF document text
    • http://vekemelegewimo.atwebpages.com/global_ecological_footprint.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/ada_gestational_diabetes_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46b2f97-5b30-40e3-9bde-dffec6e2944e/data_science_jobs_in_australia_quora.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_7c7fa960c635474286f963aa8339f1f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/how_to_cancel_registration_for_sat_subject_test.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_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 5500 bytes
SHA-256: 25405858584bfc336da627792afd190610a486f380b8132277ddfb739faa3a2f
font_01_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 11076 bytes
SHA-256: 97bd25442c403eaeedbc954e66d1a0336da6cdb39bff3e1e1013a90da19d28f4