Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1b44a5751f5a36…

MALICIOUS

PDF

130.1 KB Created: 2021-03-22 12:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 13d5e1bfc2a391c9618d919dfd3c99b8 SHA-1: e170086556d3717187bf1afed6190085d206cad3 SHA-256: 1b1b44a5751f5a36a714ce5e18bc8ad930e6e057a30d47e85c4a046043a96668
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous links, including to disposable hosting, suggests a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gimoguvi.ru/wix?keyword=chip+chan+subreddit PDF link annotation
    • https://cdn.sqhk.co/wireriduwude/2pjdEjf/jujojikum.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/zesidexib.pdfIn PDF document text
    • https://cdn.sqhk.co/dabizogi/WcjgspI/32114157465.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/5ohibjc/simot.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/iicCP8U/derailed_2002_movie_trailer.pdfIn PDF document text
    • https://gefedotozowane.weebly.com/uploads/1/3/4/3/134395864/segakiwanor.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/54725908943.pdfIn PDF document text
    • https://zegemukugemilut.weebly.com/uploads/1/3/4/7/134707242/124557.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/cUPlijh/bitmoji_classroom_ideas_for_special_education.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/gebowowexevazed.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/fafsa_application_questions.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://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_241e04b2003144049f704004758e306b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/how_to_connect_vizio_bluetooth_soundbar_to_tv.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_aa0c95bc2dd6414fa50e931183122877.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_ab3bbe276b39474ba4d1e8d631d1a5d0.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_4a4bcd3263554cbc8f6b1bfc30cb778c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/citrix_netscaler_mpx_datasheet.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_2065ad9eed8b4b18b130271c3a74c16b.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_7fccc135a9214b37bd5b04c107c10b70.pdf?index=trueIn PDF document text
    • http://xepuzakudera.atwebpages.com/19525605050.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_69a5d918cd3e4d948b571badf9b4877f.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_915e3e42b9724487b761d394bc0c985f.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14287 26800 bytes
SHA-256: 51ff80e53711cb3ade8ee6745f5e3dd9e79bb0832c1673f4386e47ecd5f71b2a
font_01_sfnt_off00019792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19792 5064 bytes
SHA-256: abf6b78d502e61bd94c05a25c4b69d4283af64f99a1476dba990a721c821c49d
font_02_sfnt_off0001a8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8A9 13336 bytes
SHA-256: 14250fd93874db17981216e9ef7985ee178c37d6c97ee40f9a8640b58549ef54
font_03_sfnt_off0001d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D40D 17000 bytes
SHA-256: 025c913462d4c208760f834b9560c428c11b2cadfad48a9efeeaf877ac570f89
font_04_sfnt_off0001ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC28 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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