Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ead8a8fac587b9…

MALICIOUS

PDF

68.9 KB Created: 2021-04-07 20:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c1b73c8bd1adbde6357e44c918ec56a7 SHA-1: 86955c8b53058a2f5e885c5b2b3011c97037f669 SHA-256: 90ead8a8fac587b93994013bbcf9b0dfeb6aaef87b5fb8bdfc7248491480eeef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The embedded URLs suggest an attempt to redirect users to external, potentially malicious content. The presence of a large number of links, including one pointing to a known malicious redirector, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://dafemum.ru/wix?keyword=simular+con+pcwr In PDF document text
    • https://cdn.sqhk.co/zofizitene/zGpGifN/28486940882.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/e6d8e133.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/iyjbYe7/slick_slime_sam_diy_school_supplies.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/0fhcKGX/league_of_lord_full_movie_youtube.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/kixitepikiri_simagux_misagizizawud.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/hBa5KmL/vuzoguxujejunexepozib.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/9a649.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/aPmjeu2/parent_plus_loan_rates.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/bevetelolar.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/pukiza/megapotodatixi.pdfIn PDF document text
    • http://gipizaz.rf.gd/play_online_bomberman_game_free.pdfIn PDF document text
    • http://ruxopagotar.epizy.com/10848993849.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_8a336a7f52a6424cbb2080982f5d5a87.pdf?index=trueIn PDF document text
    • http://najazelep.rf.gd/rabuxegizef.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_44fff21a2c1b4c8299632e7662a4099d.pdf?index=trueIn PDF document text
    • http://xofigawarogipiw.rf.gd/gajodakuvaxer.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/characteristics_of_useful_information.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/machine_learning_algorithms_for_weather_prediction.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/netflix_serien_en_ipad.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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 4780 bytes
SHA-256: d1e68b69b94bfa22b9c638a5ca98fe5df697d532f63e4786011c10618adab40e
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 9748 bytes
SHA-256: 9195bd1e7293affc905c2007c213ee1070cf05dfc15f96b62adb345b27357378
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176