Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e42e36c2373f03…

MALICIOUS

PDF

83.0 KB Created: 2020-03-16 10:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ea4cd13b980fc9692139afa420eb576 SHA-1: cbfee65671bb97689ad3a5039cfa284375241dc5 SHA-256: d8e42e36c2373f03143904b3a798d9b44cf095cc24a8a49bcc9ddf0fcd31ed81
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to PDF files with numeric or generic slugs, indicative of a link farm or SEO abuse. The document body text mentions 'Arjun reddy movie background music free', likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the first external URI found, which also appears in the document body.

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://74-123-75-90.mgwnet.com/uploads/1/3/1/0/131071047/131071047.html#arjun+reddy+movie+background+music++free
    • http://anitaravishankar.com/uploads/1/3/0/3/130313306/f58f20d0bb151f9.pdf
    • http://www.cleodiapercake.com/uploads/1/3/0/7/130776132/ruxadozujiwizewunopu.pdf
    • http://www.mrsparkyelectrical.com.au/uploads/1/3/0/6/130640164/827f5860e.pdf
    • http://msgolfforeacure.com/uploads/1/3/0/5/130551805/ximarupif.pdf
    • http://autodiscover.akics.org/uploads/1/3/0/5/130550703/c9a846043.pdf
    • http://canalgate.org/uploads/1/3/0/4/130436202/wugewofuk-jesovowibewako.pdf
    • http://prestigeassistedlivingllc.com/uploads/1/3/0/2/130289722/f82c2d2a60d.pdf
    • http://mikejamescalvert.org/uploads/1/3/0/7/130776433/vesefubibu.pdf
    • http://obiesglastonbury.com/uploads/1/3/0/7/130776672/posumulifepema-gakilurikozu-xikumajorole.pdf
    • http://www.nimblescooters.eu/uploads/1/3/0/7/130775843/mafofifejano_bobefofetifuv.pdf
    • http://activatemelbourne.com.au/uploads/1/3/0/7/130740265/sadivibolikowajek.pdf
    • http://tihder.com/uploads/1/3/0/2/130274166/geniludutuvak.pdf
    • http://mutating.net/uploads/1/3/0/6/130604433/mivalekuvuvugo.pdf
    • http://lexington-mls.com/uploads/1/3/0/8/130814195/femafoti-tusavisafa-balipatotuvuxe-belawewiti.pdf
    • http://www.orderfromchaoswi.com/uploads/1/3/0/7/130776229/gosagifosumerifuti.pdf
    • http://resilientscholars.com/uploads/1/3/0/3/130379675/fbb19c22a2089.pdf
    • http://www.electcathyjames.com/uploads/1/3/0/4/130493476/02ba2ded5d6.pdf
    • http://biermanhockey.com/uploads/1/3/0/6/130620644/78750.pdf
    • http://mayoproperties.com/uploads/1/3/0/3/130313363/927a319d1f2.pdf
    • http://delucalawoffices.net/uploads/1/3/0/8/130874012/77dc3fc6d8e3.pdf
    • http://www.evergladesorganics.com/uploads/1/3/0/6/130620807/9ca4d.pdf
    • http://sanddollarsurfcompany.com/uploads/1/3/0/4/130490561/35953.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ba.bin
5278024270de67705d3a5034a26ce2f5e1d9e53f50705cc770b2190155f81e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 6728 bytes
font_01_sfnt_off0001055d.bin
cf3ca10ab09a07cbdccf82c607e0c600c085764fd60da5f98c1a21b4eca62459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 8944 bytes
font_02_sfnt_off00012784.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 16164 bytes

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