Malicious PDF — malware analysis report

Static analysis result for SHA-256 8732ad675d1737a1…

MALICIOUS

PDF

43.0 KB Created: 2020-03-24 18:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9736466febe3588565a4f84ae64d9946 SHA-1: b8c9b11095a748c51bbda580639fb0a257ca9ae2 SHA-256: 8732ad675d1737a1a788ba063a853bf704079e9ec4bf7986188efee8874ec1e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a multitude of external PDF resources, which could be used for phishing, malware distribution, or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://marcosforlpf.com/uploads/1/3/0/5/130546432/130546432.html#descripcion+de+los+bloques+integrados+de+app+inventor
    • http://deltasoulsoftware.com/uploads/1/3/0/2/130270762/f21ade535774fc0.pdf
    • http://beautifulminddesigns.com/uploads/1/3/0/5/130550817/mimorifuku.pdf
    • http://michaelmccaughan.com/uploads/1/3/0/8/130874519/sasap.pdf
    • http://laborforceserv.com/uploads/1/3/0/5/130589362/7875834.pdf
    • http://www.sacrificialted.org/uploads/1/3/0/5/130590229/zopawunawinij.pdf
    • http://fritolaysautos.com/uploads/1/3/0/5/130544384/8419813.pdf
    • http://leagueofwickedstepmothers.com/uploads/1/3/0/5/130590622/kanemeborubizurapasi.pdf
    • http://micasusa.com/uploads/1/3/0/8/130813118/4075294.pdf
    • http://www.mcgeeairservice.com/uploads/1/3/0/5/130540246/fuwug-kutukupamitur-vuxaberuxenene-jolubanu.pdf
    • http://www.deserthighlandswcs.com/uploads/1/3/0/6/130621115/2783423.pdf
    • http://pdepaintshop.com/uploads/1/3/0/6/130621436/tofofug.pdf
    • http://crossroadsjobsolutions.com/uploads/1/3/0/8/130874239/a6e626604.pdf
    • http://www.inlakeshstudiotwo.info/uploads/1/3/0/4/130435842/113d6160.pdf
    • http://www.elisadesign10.com/uploads/1/3/0/4/130491179/peroderonanipafat.pdf
    • http://www.happylifeplanners.com/uploads/1/3/0/5/130551363/2502536.pdf
    • http://hypebeastcon.com/uploads/1/3/0/4/130488851/24d263cc28b5.pdf
    • http://oncallathletics.com/uploads/1/3/0/5/130538923/jurusuvoxoxupe_jazixebini_vadajiguvezag_pazaxofe.pdf
    • http://www.laboroflovetyler.com/uploads/1/3/0/6/130604605/f9971f5.pdf
    • http://www.donitadennis.com/uploads/1/3/0/6/130621312/xologiforusegam.pdf
    • http://erikbucoy.com/uploads/1/3/0/6/130620776/3564011.pdf
    • http://herbtimeplus.com/uploads/1/3/0/4/130483973/3318055.pdf
    • http://tojireg.store/uploads/1/3/0/2/130289457/9893853.pdf
    • http://drommusic.com/uploads/1/3/0/3/130323199/6da6185886a4.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af4.bin
77451583f6499abcb392bd2aedae5b672f94b79e1213e02d90c2a7b7094e7825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF4 9204 bytes

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