Malicious PDF — malware analysis report

Static analysis result for SHA-256 53483842af77af03…

MALICIOUS

PDF

77.6 KB Created: 2021-04-26 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 035bf93b50708184ee1d2d90c05e1494 SHA-1: 099a1993d1bf8cf4fefaf3e1e1ba09f403fe12cd SHA-256: 53483842af77af03b7e16eba12ec1dff8067eea4c0af776e4cf1af92ca0540b9
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body, though obfuscated, references 'Walgreens blood pressure monitor instructions', a common lure for phishing scams. The presence of external URIs and a link farm indicates the document's primary purpose is to redirect users to malicious sites.

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://pelibifir.ru/strik?utm_term=walgreens+blood+pressure+monitor+instructions PDF link annotation
    • http://mklhhhh.space/58517215985wuxxi.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/fundamentals_of_construction_estimating_and_cost_accounting.pdfIn PDF document text
    • http://lolabarafusiru.iblogger.org/jesaxuvizupokiros.pdfIn PDF document text
    • http://rubyshup.space/functional_group_in_chemistryi2hin.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/atresia_de_vias_biliares_clasificacion.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/51964960488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozonijegexovu.epizy.com/92348301859.pdfIn PDF document text
    • http://nolopunupibu.rf.gd/network_engineer_job_description.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_d4101d88f95847c18db2844defa43fde.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_45668e971a6241d9a24750513e59109f.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_d51c729b71ce488ab2be315e279fdd77.pdf?index=trueIn PDF document text
    • http://merapenerabari.myartsonline.com/18734516000.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_515ae594f53d4bf187d74f294d25532b.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_9e7a4dd437014c1083e3579355da34bc.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_f22d0664b9f34368a1e0f21c42f35b47.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_a15ff3a478274d9b9959e45f77efd1bf.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_447e0586e6674aeb9b720d6e998a8d25.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_7ab272eb4da842a3bbc806d26975a6fd.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_0eacdd240f6149e681741db1ca3f4790.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_1b59ef86d3894c2e98e8213b0ce1f72a.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_3cc1f3ed95cb464a9eee4ee0b76f5175.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_b16b5a3b6fe44a55adc1f1be6027688a.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_20fcb2ac7bb2477d91251aadc72d5431.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_26689b0a98b84623b0130185418a9ed9.pdf?index=trueIn PDF document text
    • http://rajamuviw.epizy.com/how_to_read_hieroglyphs_for_beginners.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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 5548 bytes
SHA-256: dc4847d7caa1f42ba9d5ef9c1b87f94c79a3a855604a06d4664e0a10005118b4
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10852 bytes
SHA-256: 0afd22036cc73417164041ac68c4dafbaacb8dec68210cc02f9399ed260b55f7