Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c49615ab465cc3…

MALICIOUS

PDF

55.6 KB Created: 2020-03-20 09:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28b8a12e63bf875aae636da2bc7414e7 SHA-1: 1198c6d5cba7552800a5934268d7520ea4704e16 SHA-256: 79c49615ab465cc3721ebb642c1403a5e5c7e054129f24d37b6b4a1dc7dca28a
96 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 document body text, while partially garbled, includes a question about the least common multiple, suggesting a potential lure. The primary function appears to be redirecting users to a network of linked sites, likely for SEO spam or to host further malicious content.

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://doctorpk.net/uploads/1/3/0/8/130815137/130815137.html#cual+es+el+minimo+comun+multiplo+de+5+7+9
    • http://nanaspizzapr.com/uploads/1/3/0/4/130435690/disewimuvonajowotime.pdf
    • http://www.curriculumdevelopmentunit.com/uploads/1/3/1/0/131070355/604786.pdf
    • http://hostmaster.smbdigitalista.events/uploads/1/3/0/5/130538869/kozesijujemadezugom.pdf
    • http://riellyrealty.com/uploads/1/3/0/8/130813921/4290790.pdf
    • http://opjunk.com/uploads/1/3/0/5/130590186/fajozumoseduwufew.pdf
    • http://www.justtilesnbathrooms.com/uploads/1/3/0/4/130483650/gikasakax.pdf
    • http://www.uncertainaddict.com/uploads/1/3/1/0/131071117/xinoxumebasevu_lavajoxesewinig_dedunesagun.pdf
    • http://premierlvpm.org/uploads/1/3/0/6/130639922/bd5c679.pdf
    • http://eliseidnani.ca/uploads/1/3/0/4/130477310/bofudapidawo_wezezuwafojiluz_funiniwolojut_sevasiz.pdf
    • http://sjdaplants.com/uploads/1/3/0/8/130814611/butunaxuzij-rigemuzodemu.pdf
    • http://8uxk6.slpny.com/uploads/1/3/0/7/130738697/9262672.pdf
    • http://mmflackdesigns.com/uploads/1/3/0/4/130489351/e8f51.pdf
    • http://www.nyiabc.com/uploads/1/3/0/2/130272579/begokidef.pdf
    • http://cfdaccounting.net/uploads/1/3/0/4/130488530/dumuzagos.pdf
    • http://youarenotaloneproject.com/uploads/1/3/0/6/130620594/4103438.pdf
    • http://74-123-77-144.mgwnet.com/uploads/1/3/0/4/130435751/xilumuzomisir_rixubimivus.pdf
    • http://mistersack.net/uploads/1/3/0/2/130274151/sonifab.pdf
    • http://karenthebard.com/uploads/1/3/0/8/130874620/jifutag_zigajo.pdf
    • http://www.carforsalebyowner.net/uploads/1/3/0/7/130739776/ca80b2fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008be1.bin
4df4d7a04bde2c4513254394f1b435045f7652e27b9949f1c260c42459864009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE1 9632 bytes
font_01_sfnt_off0000aef2.bin
b6d40d9d2d0acd72f80ea8cb43a3453032b8eed530ab7bdda3a51c02bab8c179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF2 2828 bytes
font_02_sfnt_off0000b908.bin
be6ed36b530f0133d70bfc75b4b833ca866f6c9b19750924bd73e8f1017de2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 16072 bytes

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