Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb26ea6d5a9c7712…

MALICIOUS

PDF

49.6 KB Created: 2020-06-07 01:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f188d87d3411f4afd6ca3398c7e7525c SHA-1: 53f3ae2b78cb999a24e9c5212283e9123a7b236c SHA-256: eb26ea6d5a9c77123f84974803e9fc4ca7484e36cb959a675c205b3358817dfe
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these external URLs, suggesting a link farm or redirection scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://g9bwu.bpmtc.com/uploads/1/3/0/6/130639489/130639489.html#sahih+al+bukhari+in+hindi+pdf
    • http://barnesbroscatering.com/uploads/1/3/0/7/130775871/fegofaxu_belugedivotek_vegovejeput_tojazunujojagal.pdf
    • http://webmail.mtnsaa.org/uploads/1/3/0/6/130640024/8042694.pdf
    • http://blog.patriciagajo.com/uploads/1/3/1/3/131380205/mokofuju.pdf
    • http://amckochen.net/uploads/1/3/1/4/131483421/fobifuzabaka.pdf
    • http://inthereins.com/uploads/1/3/0/7/130776007/5081546.pdf
    • http://dreamnails-simpsonville.com/uploads/1/3/0/2/130272877/lujifigel.pdf
    • http://keanicello.com/uploads/1/3/0/6/130621243/letupim.pdf
    • http://myfoundation.us/uploads/1/3/0/3/130323761/2854432.pdf
    • http://sincityfindsvintagejewels.com/uploads/1/3/1/3/131379353/difonidanukorezidu.pdf
    • http://rapgameclothing.com/uploads/1/3/0/7/130775728/sebujanaw-ranilid-lelomet-ledovibekoveke.pdf
    • http://strikeandhammer.com/uploads/1/3/1/4/131437924/1eb1a9f.pdf
    • http://220-web1.a-r-a.org/uploads/1/3/0/3/130323277/2448225.pdf
    • https://resodepirum.files.wordpress.com/2020/06/dagaxolobidivapabuwovepu.pdf
    • https://rabimigoliv.files.wordpress.com/2020/06/31139023056.pdf
    • https://resodepirum.files.wordpress.com/2020/06/63633567122.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00008a73.bin
70a4fed5a827edcb9439eba1dedc6da3c97fd7e60eff930fcff15f8940ca7130		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8A73 27644 bytes
font_00_sfnt_off0000656b.bin
c1fcd01d550f779a93d37bbb1d7d636aee4d8506eca4a99f527866f11ea42b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 11400 bytes

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